一夜之间，流言蜚语开始变成头条新闻了。

Overnight, the gossip begins to mutate into headlines.

《柯林斯英汉双解大词典》

秋天的落叶开始变成褐色。

Autumn leaves begin to turn brown.

youdao

鸡开始变成棕色，差不多准备好了，但是客人还没有到。

The fowls began to turn brown, and were nearly ready, but the guest had not yet arrived.

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But the presence of the dog there is a conditioned stimulus and so you grew to be afraid of dogs.

而这时狗的存在就变成了条件刺激,所以你开始对狗心生恐惧。

耶鲁公开课 - 心理学导论课程节选

So even though we might have started with 500 some odd people, it very quickly became a 250 person problem and then a 125 person problem.

尽管刚开始的时候,人数是500左右，很快就变成了一个250人的问题,再变成125人的问题。

哈佛公开课 - 计算机科学课程节选

It starts out ugly and becomes a beautiful swan.

开始很丑,然后变成一只美丽的天鹅

耶鲁公开课 - 死亡课程节选