The percentage of students who valued the access to sports facilities more than tripled from 5% to 18% in 2001.
这句话表达对不对？这句话里 more than tripled 前面是否需要加 is，不加是否就错了？
The percentage of students who valued the access to sports facilities more than tripled from 5% to 18% in 2001.
参考译文：珍惜借助体育设施的学生百分比在2001从5%到18%增加了3倍多。
解答如下：
句子谓语为：triple，因此无需在家谓语“is”
vi./vt. 变成三倍;增至三倍 (英语讲解：If something triples or if you triple it, it becomes three times as large in size or number.）
I got a fantastic new job and my salary tripled.
我得到了一份很好的新工作，薪水涨到了原来的 3 倍。
The Exhibition has tripled in size from last year.
展览会规模自去年已经扩至3倍。
