Definition
Used to express that a series of unfortunate events keeps happening.
一波未平，一波又起
I was late for work this morning, and then my car broke down. It's just bad luck, if it's not one thing, it's another.
我今天早上上班迟到了，然后我的车又坏了。真是倒霉，不是这件事，就是那件事。
She just recovered from a cold, and now she has a fever again. It's just, if it's not one thing, it's another.
她刚从感冒中恢复，现在又发烧了。真是，不是这件事，就是那件事。
I was hoping to relax this weekend, but first it rained, and then there was a power outage; if it's not one thing, it's another.
我本来希望这个周末可以放松一下，但先是下雨，然后又停电；不是这件事，就是那件事。