1.She made helpful comments on my work.她对我的工作提出了有益的意见。
2."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.""这是动物在野外做决定的一种非常明智的方式,几千年来对人类都是非常有益的。"
3.It is often helpful for teachers to shadow managers in industry.教师跟随业界的管理人员实地学习，常常会很有收获。
