由于需求激增，我们的产量在过去三个月里增加了两倍。

Our production has ___tripled in the past three months due to a surge in demand.

他把投资金额增加到了原来的三倍。

He ___tripled his investment amount.

他在第三局打出了一个漂亮的三垒打。

He ___tripled in the third inning with a great hit.