突变事件是气候系统中存在的一种现象。
黑色岩系的形成反映了环境的突变事件，构成了许多重要矿床的赋矿岩系。
The presenting of black shale series reflects abrupt environmental events, which formed many important ore hosting rock series.
如果是实例元素属性的一个突变事件，我需要同时调用两个方法相应的修改按钮的外观。
If it's a mutation event on one of the attributes of the instance element, I'll call both of the methods responsible for fixing the button's appearance.
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