“变成三倍”常见的英文表达有 “triple”（动词用法） 、“become three times as large/much” 或 “increase to three times the original amount/size” 等。具体如下：
triple：这是最简洁常用的表达，作为动词，直接表示“使变为三倍；使增至三倍” 。例如：The company's profits have tripled in the last year.（去年公司的利润变成了原来的三倍 。）
become three times as large/much：这是一种比较直观的表达方式，清晰说明了变化后的结果是原来的三倍大小或数量。例如：The population of this city has become three times as large as it was ten years ago.（这座城市的人口已经变成了十年前的三倍。 ）
increase to three times the original amount/size：此表达详细说明了增加的程度，即达到最初数量或大小的三倍。例如：We plan to increase our production to three times the original amount next year.（我们计划明年将产量提高到原来的三倍。 ）