shot in the arm

兴奋剂
刺激物

详细释义：

【美】【俚】刺激因素; 鼓励

Mom's phone call was a real shot in the arm.

妈的电话真能鼓舞人。

Your encouraging words were a real shot in the arm.

你对我的鼓励真是一针兴奋剂。

The money was a shot in the arm for the company.

这笔钱给这家公司带来了活力。