TOEFL Speaking Task 4 Sample: Using points and examples from the lecture, describe two functions of aerial roots.

1.子项得分

• 交付：3

• 语言使用：3

• 话题发展：3

2.预估分数

• 总分：23

3.表达 从交付方面来看，发言者的语音清晰，语速适中，但偶尔有停顿。建议发言者在练习时注意掌握连贯流畅的语言表达，减少不必要的停顿。同时，注意提高发音准确性，以避免拼写错误。

4.话题发展 从话题发展方面来看，发言者提供了一个相对连贯和有组织的回答，并且在回答中使用了两个例子来支持观点。但是，在描述第二个功能时，发言者没有明确指出这个功能是吸收水分和营养。建议在练习时注意明确表达观点，并确保提供足够的支持或例子。

5.语言使用

原文：In this lecture, the professor gave us the two examples of the functions of the aerial routes. In this lecture, the professor provided two examples of aerial root functions.（将“gave us”改为“provided”，使语言更自然；将“the functions of the aerial routes”改为“aerial root functions”，使表达更准确。） But the first function is to support. The first function is support.（删除“but”，使句子更简洁；删除“is to”，使表达更自然。） He used the example of maize plant, also called as coins. He used the example of the maize plant, also known as corn.（将“called as coins”改为“known as corn”，使表达更准确。） Well, coins has a root system are fabric and shadow, which cannot support the tall plants. Corn has a fibrous and shallow root system that cannot support tall plants.（将“coins”改为“corn”，使表达正确；将“are fabric and shadow”改为“fibrous and shallow”，使表达准确；调整句子结构，使语言流畅。） As a result, it developed the aerial route so that they can go down and branch out and support sideways to protect the tall planet against the strong wind. As a result, it developed aerial roots that extend downward, branch out, and provide lateral support to protect the tall plant against strong winds.（将“the aerial route”改为“aerial roots”，使表达准确；调整句子结构，使语言流畅。） Well, the second point is the functions can help them to absorb moisture and nutrition. The second function is to help plants absorb moisture and nutrients.（调整句子结构，使语言流畅。） And he used the example of mongoose trees. He used the example of mangrove trees.（将“mongoose trees”改为“mangrove trees”，使表达正确。） And mongoose trees developed the aerial routes to absorb gases and save nutrition in order to survive because the underground root system can always under the water, so cannot function well. Mangrove trees develop aerial roots for gas absorption and nutrient storage in order to survive because their underground root systems are often submerged in water and cannot function effectively.（将“mongoose trees”改为“mangrove trees”，使表达正确；调整句子结构，使语言流畅。）

修订后的回答（140字）：

In this lecture, the professor provided two examples of aerial root functions. The first function is support. He used the example of the maize plant, also known as corn. Corn has a fibrous and shallow root system that cannot support tall plants. As a result, it developed aerial roots that extend downward, branch out, and provide lateral support to protect the tall plant against strong winds. The second function is to help plants absorb moisture and nutrients. He used the example of mangrove trees. Mangrove trees develop aerial roots for gas absorption and nutrient storage in order to survive because their underground root systems are often submerged in water and cannot function effectively.

6.思维导图

Aerial Root Functions
├─ Function 1: Support
│   └─ Example: Maize plant (corn)
│       └─ Fibrous and shallow root system
│           └─ Aerial roots for lateral support
└─ Function 2: Absorb moisture and nutrients
    └─ Example: Mangrove trees
        └─ Aerial roots for gas absorption and nutrient storage
            └─ Underground root systems often submerged in water

7.关键词

1.子项得分

• 交付 (Delivery): 3

• 语言使用 (Language Use): 3

• 话题发展 (Topic Development): 3

2.预估分数

• 总分: 23

3.表达 回答中的发音和语速基本清晰和流畅，但在某些地方存在一些不必要的停顿。建议在练习时注意保持连贯的语速，尽量减少不必要的停顿。同时，注意发音准确性，避免出现拼写错误。

4.话题发展 回答内容基本上涵盖了题目要求的两个功能，并给出了相应的例子。但在表述上可以更加清晰和有条理。建议在组织回答时，先简要介绍空气根的概念，然后分别阐述其两个功能，并在每个功能后给出相应的例子。此外，注意将“mango trees”更正为“mangrove trees”，以保持与原文一致。

5.语言使用

原文：Area roots Aerial roots (“Area roots”改为“Aerial roots”，以保持与原文一致) means there are some roots grow above ground, and there are two functions for these roots, firstly is about support, and the example is about maize plants such as corn corn, also known as maize plants (调整表述顺序，使句子更自然流畅), the underground roots are shallow and weak, so that they couldn't develop deeply and couldn't support the plants, therefore the corn needs to compensate and they grow the above ground roots so that there are additional support to protect from the wind, and second function is about absorbing moisture and nutrition, and the example is about mango trees mangrove trees (将“mango trees”更正为“mangrove trees”，以保持与原文一致), they live in wet environment so that the area roots aerial roots (同上，改为“Aerial roots”) could both absorb nutrition and water to supplement.

修订版（140词）：

Aerial roots are a unique type of root that grows above ground. They serve two main functions for plants. The first function is providing support, as seen in corn plants, which are also known as maize plants. These plants have shallow and weak underground roots, making it difficult for them to develop deeply and support the plant. To compensate for this, corn plants grow aerial roots from their lower stem segment, providing additional support and protection against strong winds.

The second function of aerial roots is to absorb moisture and nutrients. Mangrove trees, which live in wet environments such as marshes and bogs, are an example of this. Their aerial roots allow them to absorb nutrients and water from the air, supplementing their underwater root system. This adaptation is crucial for the survival and development of mangrove trees in their unique habitat.

6.思维导图

Aerial Roots
├── Function 1: Support
│   ├── Example: Corn (Maize) plants
│   └── Additional support against strong winds
└── Function 2: Absorb moisture and nutrients
    ├── Example: Mangrove trees
    └── Adaptation for survival in wet environments

7.关键词