The bird, however hard the frost may be, flies briskly to his customary roosting-place, and, with beak tucked into his wing, falls asleep.是什么意思_The bird, however hard the frost may be, flies briskly to his customary roosting-place, and, with beak tucked into his wing, falls asleep.在线翻译_英语_读音_用法_例句