增至原来的三倍
先理解核心含义，再看它在真实句子里的用法。
增至原来的三倍
to become three times as great in size, amount, or number
The company's profits increased threefold in just two years.
公司利润在短短两年内增至原来的三倍。
增至原来的三倍
to become three times as great in size, amount, or number
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