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重点讲解：
1.prepare for为…准备
We have to be careful about injuries but we have to prepare for that game.
我们必须要小心伤病，但是我们也必须要为比赛做准备。
2.on high alert处于高级戒备状态
Without stress management, all too often your body is always on high alert.
不去控制压力，身体会一直处于高警戒状态。
vt. 实施，执行，强制，强迫，加强
