树叶变红
Leaves turn red
以上为机器翻译结果，长、整句建议使用 人工翻译 。
即使你从未怀疑过这就是树叶变红时的情况，它还是有迹可循的。
Even if you had never suspected that this is what was going on when leaves turn red, there are clues out there.
youdao
寒冷的天气使树叶变红了。
The cold weather turned the leaves red.
《新英汉大辞典》
树叶变红了。
Leaves turn red.
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