If you have one reason for doing something and I give you a second reason for doing the same thing, it seems only logical that two reasons are better than one and you're more likely to do it.
如果你有一个理由做某件事， 我会给你第二个理由做同样的事情 仅仅从逻辑上来讲，两个理由似乎要比一个理由好 你就更有可能去做。