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。
I called the police but they weren't very helpful.
我叫了警察，但他们不太肯帮忙。
You'll find it helpful to talk things over with a friend.
把情况和朋友详细聊一聊，你会觉得大有帮助。
The people I spoke to were very helpful.
我交谈过的人都很肯帮忙。
The booklet should be very helpful to parents of disabled children.
这本小册子对于残疾儿童的父母会很有用。