explain的意思有解释、阐述、说明。有及物动词和不及物动词之分。
及物动词用法：
1、解释；说明；阐明[(+to)][+wh-][+(that)]
He explained that he had been cheated.
他解释说他是上当受骗了。
Can you explain how the machine operates?
你能解释一下这机器是如何运转的吗？
Please explain this rule to me.
请给我讲解一下这条规则。
2、为…辩解；说明…的理由(或原因)[+wh-]
He made up a story to explain why he was absent.
他编造了一个故事为他的缺席辩解。
不及物动词用法：
1、解释；说明；辩解
I've got to explain about it.
我得解释一下此事。
