试题题干
Translate the following sentence into Chinese.
Therefore, it is necessary for those people who train them to be very patient and understanding.
参考答案
试题解析
考点：it is necessary for sb. to do sth.对某人来说某事是必须的；patient耐心的。
句子结构：主句为it is necessary for those people，who引导定语从句修饰 those people。