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他知道，苹果青的时候，不要去摘。
He knew the apple must not be picked while it was green.
youdao
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老师：什么时候是从树上摘苹果的最佳时机？
Best time Teacher: When is the best time to pick the fruit from the trees?
youdao
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老师：什么时候是从树上摘苹果的最佳时机？
Best time Teacher: When is the best time to pick the fruit from the trees?
youdao