He lay helpless on the floor.

　　他無(wú)助地躺在地板上。

　　The audience was helpless with laughter.

　　觀眾情不自禁地大笑。

　　Oh, to think of his poor wife, standing there helpless

　　噢！想想他可憐的妻子，無(wú)助地站在那里。

　　Children are dying, and I am helpless to do anything

　　孩子們已奄奄一息，而我卻無(wú)力做任何事情。