• 1. Begin level: 起始层

• 1.If we have indeed entered a new epoch, then when exactly did it begin? When did human impacts rise to the level of geologic significance?
  如果我们确实进入了一个新时代，那么它究竟是什么时候开始的？什么时候人类的影响上升到地质意义的水平？
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• 2.Efforts are in place to expose more black, Hispanic, and low-income students to advanced math, in the hope that the demographic pool of high-level contenders will eventually begin to shift and become less exclusive.
  为了让更多的黑人、西班牙裔和低收入家庭的学生接触高等数学，已经开始采取了一些措施，希望这些高水平竞争者的人口结构最终会开始改变，变得不那么排外。
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• 3.If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities.
  如果这种变暖发生，两极的冰帽将开始融化，从而使海平面上升数米，并严重淹没沿海城市。
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