我想我拉伤了腿部的一块肌肉。

I think I've ___strained a muscle in my leg.

不要在光线差的地方看书，否则会损伤你的眼睛。

Don't read in poor light or you'll ___strain your eyes.

医生告诉我不要提重箱子，以免拉伤背部。

The doctor told me not to ___strain my back by lifting heavy boxes.