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口语练习
Silence, the best way to let someone know they did wrong. 保持沉默，是让别人知道他们做错了的最好方式。
重点词汇
fall down 倒塌，跌倒; 失败; 趴架; 栽倒
例句：Babies often fall down when they learn to walk.婴儿在学走路时经常摔倒.
重点词汇
