1. His mood is quite curial, you never know how he will react to something.
他的情绪非常善变，你永远不知道他会对某件事如何反应。

2. The weather in this region is curial, it can change from sunny to rainy within minutes.
这个地区的天气非常多变，几分钟之内就可以从晴天变成下雨。