/weather: 把天气设为晴天、雨天或雷暴，或显示当前天气。
语法
<尖括号> 内为必填，[方括号] 内为可选。 /weather 有 2 种写法：
/weather <type: weathertype> [duration: int]
/weather <query: weatherquery>/weather
命令: 命令
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