句子其他内容不改变地方，relate to和is related to能否直接替换，譬如
The readings relate to the class discussions.这类读物与课堂讨论有关。
The survey suggests that financial success is closely/strongly/directlyrelated to a person's level of education.调查显示，经济收获与一个人的教育水平有紧密/很大/直接的关联。
不能直接替换，一个是动词短语表示涉及，谈论，一个表示有关，暗含因果等。假如The survey suggests that financial success relates to a person's level of education.那就是金融成功就是个人教育水平。
