第23课: 鸟的飞行方法 Bird flight | 新概念英语4

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# Read and answer this question: What are the two main types of bird flight described by the author?

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No two sorts of birds practise quite the same sort of flight; the varieties are infinite; but two classes may be roughly seen.

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Any ship that crosses the Pacific is accompanied for many days by the smaller albatross, which may keep company with the vessel for an hour without visible or more than occasional movement of wing. The currents of air that the walls of the ship direct upwards, as well as in the line of its course, are enough to give the great bird with its immense wings sufficient sustenance and progress.

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第23课: 鸟的飞行方法 Bird flight
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