你已经可以看出区别来了,第一个better这么做更好,但是第二个best就是这么做最好
一般其实是一个意思,但是如果非要讲区别,就是上策和上上策的区别
例子
It's a bad idea to give your girlfriend a toad for her birthday.It's better to give her nothing.Yet it is best to buy her a necklace.
你女朋友生日的时候送她一只蛤蟆是糟透了的想法.什么都不送还稍微好一点.但是送她项链的话当然最好
如果还有问题可以找我~