Some window and component focus events have corresponding opposite events. These event sets include.
一些窗口和组件的焦点事件含有相应的对立事件。
For each particle there should be a corresponding antiparticle with exactly the same mass and lifetime but with an opposite electrical charge.
每个粒子都应该对应着一个反粒子,它们的质量和寿命完全相同,但带有相反的电荷。
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