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Stray birds of summer come to my window to sing and fly away。And yellow leaves of autumn, which have no songs,flutter and fall there with a sign
夏天流浪的鸟儿来到我的窗前，歌唱然后飞走。
秋天金黄的叶子无声的飘动，然后带着某种征兆飘落。

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do you want to write "with a sigh" instead of "with a sign"?
sigh叹息