新概念英語第四冊(含lrc文本)Lesson 23 Bird flight

[ti:δ?] [ar:] [al:] [by:https://www.lrc.com.cn] [00:02.35]Lesson 23 [00:04.96]Bird flight [00:10.82]What are the two main types of bird flight described by the author? [00:18.11]No two sorts of birds practise quite the same sort of flight; [00:22.68]the varieties are infinite;but two classes may be roughly seen. [00:28.49]Any ship that crosses the Pacific [00:30.58]is accompanied for many days by the smaller albatross, [00:34.76]which may keep company with the vessel for an hour [00:37.82]without visible or more than occasional movement of wing. [00:42.62]The currents of air that the walls of the ship direct upwards, [00:46.41]as well as in the line of its course, [00:49.09]are enough to give the great bird with its immense wings [00:52.60]sufficient sustenance and progress. [00:55.84]The albatross is the king of the gliders, [00:58.94]the class of fliers which harness the air to their purpose, [01:03.37]but must yield to its opposition. [01:06.29]In the contrary school,the duck is supreme. [01:10.76]It comes nearer to the engines with which man has 'conquered' the air,as he boasts. [01:16.50]Duck,and like them the pigeons,are endowed with steel-like muscles, [01:22.08]that are a good part of the weight of the bird, [01:25.13]and these will ply the short wings with such irresistible power [01:29.66]that they can bore for long distances through an opposing gale [01:34.03]before exhaustion follows. [01:37.03]Their humbler followers,such as partridges, [01:40.18]have a like power of strong propulsion, but soon tire. [01:44.98]You may pick them up in utter exhaustion, [01:47.62]if wind over the sea has driven them to a long journey. [01:52.10]The swallow shares the virtues of both schools in highest measure. [01:56.34]It tires not,nor does it boast of its power; but belongs to the air [02:02.21]travelling it may be six thousand miles to and from its northern nesting home, [02:08.33]feeding its flown young as it flies,and slipping through a medium [02:12.95]that seems to help its passage even when the wind is adverse. [02:17.93]though we no longer take omens from their flight on this side and that; [02:24.56]and even the most superstitious villagers [02:26.92]no longer take off their hats to the magpie and wish it good-morning.

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