When you decide to do something, stick to it.
當你決定做某事時，要堅持到底。
So it made sense to decide to do something together.
所以我們兩方決定攜手合作也就在情理之中了。
I decide to do something different this term.
這個學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，請讓我知情。
It's not being able to decide what way to do something.
是無法決定用什么方法去做一件事。