reason：原因;理由;解释;正当理由;道理;情理;思考力;理解力;理性。
第三人称单数： reasons 现在分词： reasoning 过去式： reasoned 过去分词： reasoned。
单词用法：
it stands to reason：这是人人都清楚的；这是明摆着的
例：It stands to reason that they'll leave if you don't pay them enough.
译：这是明摆着的，你不给他们足够的报酬，他们就走人。
reason with sb：和某人讲道理；规劝
例：I tried to reason with him, but he wouldn't listen.我尽量跟他讲道理，可他就是不听。