v.(使)增至三倍( triple的过去式和过去分词 );
例句:
After increasing for several years, my salary has tripled.
经过几年的发展, 我的工资已经涨到原薪的3倍了.
China's GDP in dollar terms has tripled during the same period.
中国的国民生产总值同期增长了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。