He's a snake in the grass. While pretending to be your friend he was slandering you behind your back.

他是个暗敌，表面上装作是你的朋友，背地里却在诽谤你。

Aren't I a snake in the grass?

我是不是草丛里的一条蛇呀？

Aren't I a snake in the grass.

我不就是草丛里的一条蛇。

There is a snake in the grass.

草地上有一条蛇。

Sally saw a snake in the grass.

莎丽在草丛中看见一条蛇。