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1.participate in 参加，分享
例句：Those numbers tell you something about aggregate activities, but why do individuals participate in this in the first place?
以上这些数字反映的都是群体活动，但一开始个人为什么会参加这类活动呢？
2.step up to 走近，接近
例句：However, at the application architecture level, you have to step up to another level.
不过，在应用程序架构级别，必须上升到另一个层次考虑问题。
