I thought I was safe on the branch, until my foot slipped off and I fell to the ground. 我一直以为自己在树枝上很安全,没想到脚步一滑,掉到了地上。
His foot slipped off and fell to round. 他的脚踩滑了,摔到了地上。
The book slipped off my knees. 书从我的膝盖滑落下去。
I saw him suddenly change colour, but before I could reach him he had slipped off his chair on to the floor in a faint. 我看到他突然脸色变白,急忙得去扶他,他已一阵昏晕,从椅上跌倒在地板上。