In spring, the trees turn green.

春天，树变绿了。

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The trees turn green when spring comes.

当春天来临的时候树木开始变绿了。

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Spring coming on, the trees turn green.

春天来了，树都变绿了。

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Visitors enter the park via a broad, pebbled avenue lined with twin rows of gingko trees, considered by many to be one of the most beautiful sights in the capital, especially in the autumn when golden leaves cover the path and in spring when the trees turn a fresh green.

CNN: The Best City Park