1、That snake in the grass cheated me of my money.
那個口蜜腹劍的家伙騙了我的錢。

2、The most maddening thing of all is that this snake in the grass can strike at any time.
最讓人受不了的是，這尾隱藏在草叢里的蛇隨時都可能會出擊。

3、Some snake in the grass told the teacher our plan.
有個搗蛋鬼把我們的計劃告訴了老師。