我抬那个重箱子时拉伤了背。

I ___strained my back lifting that heavy box.

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.

小心别因为打了那么多字而扭伤手腕。

Be careful not to ___strain your wrist with all that typing.