The cat crouched ready to spring.

那猫弓起背准备跳。

《牛津词典》

The cat crouched down, ready to spring on the mouse.

那只猫蹲下身来准备向老鼠猛扑过去。

youdao

The cat crouched down, ready to spring on the mouse .

那只猫蹲下身来准备向老鼠猛扑过去。

youdao

If President Clinton has been playing "rope-a-dope" and is now ready to spring off the ropes, it will give Democrats heart.

CNN: From Charles Bierbauer

When the bell rings at 7:20, he's ready to spring into action.

FORBES: Last Call

After nearly two years lost to major injuries, Yankees reliever Joba Chamberlain is finally healthy and ready to report to spring training in the hopes of claiming a top bullpen job.

WSJ: New York Yankee Reliever Joba Chamberlain Trying To Bury the Hatchet