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| 1. | Then he saw one on the surface swimming in circles. |
| 接着他看见其中的一条在海面上绕着圈儿游着。 |
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| 2. | surface skimmer [swimming pool] |
| 撇垢水槽〔泳池〕 |
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| 3. | "For animals moving on water surface or swimming in water, try to identify them and estimate their approximate |
| 生活于水面和水中的动物,尝试辨认它们和记录其大概密度、生境、及功能地位。 |
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