这个的英语怎么译.?

当作及物动词(vt)时：
explain可以接to和从句。比如：explain this rule to me (explain sth to sb)
Can you explain how the machine operates?
He explained that he had been cheated.
作为不及物动词(vi)时：explain后面要加介词:
I've got to explain about(介词) it. 我得解释一下这件事。
一般都是用explain sth to sb，explain + 从句，explain about sth.

第一个

应该是第一个如果是for sb就是解释某人不对。