Either or both feel dissatisfied or resentful.

　　他們中有一方或者雙方都感到失望和忿恨。

　　Okay that's a straightforward either or. Isn't it?

　　好，這是很直接的二選一，對(duì)嗎？

　　It must also specify the build tool to be used, either or.

　　項(xiàng)目還必須指定要使用的構(gòu)建工具，或者是或者是。