The bird closes its eyes. Just then, a drop of water falls on its head. Then, a second later, another drop falls on its tail.

小鸟闭上眼睛一会儿。就在这个时候，一滴水珠掉在它头上。接着马上又有一滴水落在它的尾巴上。

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Just as he was about to fall asleep, he felt a drop of water hit the top of his head.

正当他要睡着时，他感觉有一滴水滴在他的头上。

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Benzene homologues in water were separated and enriched by head-space single-drop microextraction and determined by gas chromatography.

采用顶空单液滴微萃取样品处理方法分离富集水中苯系物，用气相色谱法进行测定。

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