When you decide to do something, stick to it.
当你决定做某事时，要坚持到底。
So it made sense to decide to do something together.
所以我们两方决定携手合作也就在情理之中了。
I decide to do something different this term.
这个学期我想做些不同于以往的事情。
I just hope the next time you decide to do something, you include me.
下次你要做什么，请让我知情。
It's not being able to decide what way to do something.
是无法决定用什么方法去做一件事。