例句：He has an alert mind.
      他很机灵。

      A monkey is very alert in its movements.
      猴子的动作很敏捷。

2.shatter vi.破裂

例句：The shells became so thin that they shattered before the babies hatched.
      蛋壳变得这样薄，使得鹰蛋在幼鹰孵化前就碎了。

3.strengthen vt.vi.加强, 巩固

例句：The wind strengthened during the night.
      夜里风刮得更大了。

      They strengthened the city walls.
      他们加固了城墙。

4.terrific adj.极好的，了不起的, 非常棒的, 非常漂亮的

例句：The game was terrific.
      那场比赛棒极了。

      The view is terrific.
      景色美极了。

5.glide vt.vi.滑行；滑动；掠过

例句：The years glided past.
      年复一年, 时光悄然流逝。

      The stately swan glides gracefully on the pond.
      美丽的天鹅在池中优雅地游动。
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