1.at least 至少;最少
It takes at least an hour to get home from work.
下班回家至少得花一個小時 。
2.wear out 精疲力盡;穿破
People doing paper work or operating computer often, their eyesight will be easy to wear out and even fall down.
做文字工作或經常操作電腦的人,容易視力疲勞甚至下降 。
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