helpful例句：

　　She made helpful comments on my work.

　　她對我的工作提出了有益的意見。

　　"This is a very sensible way for an animal to make decisions in the wild and would have been very helpful for humans for thousands of years."

　　"這是動物在野外做決定的一種非常明智的方式,幾千年來對人類都是非常有益的。"

　　It is often helpful for teachers to shadow managers in industry.

　　教師跟隨業(yè)界的管理人員實地學(xué)習(xí)，常常會很有收獲。

　　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，你會覺得大有幫助。