知声息
Be aware of the sound
以上为机器翻译结果，长、整句建议使用 人工翻译 。
清晨，知更，猫鸟，野鸽，松鸦，鹪鹩，还有各种其它鸟声曾经在黎明时分形成大合唱，出现一派勃勃生机的清晨，现在已是毫无声息了。
On the mornings that had once throbbed with the dawn chorus of Robins catbirds doves jays wrens and scores of other bird voices there was now no sound.
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