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.
寒冷的天气使树叶变红了。
树叶变红了。
不久树叶变红了，变色龙也跟着变成红色。
Later the leaf turned red, and the chameleon also turned red.
寒冷天气使树叶变红。
树叶起先是绿色，到后来会变红。
秋天树叶渐渐地变红了。
树叶都变黄，变红，变紫了。看起来真是如天堂一样美。
Leaves had turned/got/gone/become yellow, red and purple, It really looked heavenly beautiful (beautiful like heaven).
树叶在秋天变红。
我爱抬头望着树叶，看它们从绿变红，再由红变黄，接着变成棕色。
I like to look up at the leaves changing colors from green to red and yellow, and then brown.
秋天树叶渐渐地变红了。
树叶在秋天变红。
树叶在秋天变红。
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