练习材料：
Lesson23-2 Bird flight
Duck, and like them the pigeons, are endowed with steel-like muscles, that are a good part of the weight of the bird, and these will ply the short wings with such irresistible power that they can bore for long distances through an opposing gale before exhaustion follows. Their humbler followers, such aspartridges, have a like power of strong propulsion, but soon tire. You may pick them up in utter exhaustion, if wind over the sea has driven them to a long journey. The swallow shares the virtues of both schools in highest measure. It tires not, nor does it boast of its power; but belongs to the air, travelling it may be six thousand miles to and from its northern nesting home, feeding its flown young as it flies, and slipping through a medium that seems to help its passage even when the wind is adverse .such birds do us good ,though we no longer take omens from their flight on this side and that; and even the most superstitious villagers no longer take off their hats to the magpie and wish it good-morning.
应用配置：L0+L4
知识笔记： endowed/ irresistible/ exhaustion/ partridges/ propulsion/ utter/ swallow/ superstitious/
练习感悟：用时55分。篇幅较长，最后录制的效果不好，卡顿太多，时间关系不再调整。
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