I called the police but they weren't very helpful.

　　我叫了警察，但他們不太肯幫忙。

　　You'll find it helpful to talk things over with a friend.

　　把情況和朋友詳細(xì)聊一聊，你會(huì)覺(jué)得大有幫助。

　　The people I spoke to were very helpful.

　　我交談過(guò)的人都很肯幫忙。

　　It's natural to feel helpless against such abuse.

　　對(duì)這種虐待感到無(wú)能為力是自然的。

　　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。