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重点讲解：
1. run into 意外碰到；
例句：He ran into Krettner in the corridor a few minutes later.
几分钟之后他在走廊里意外碰到了克雷特纳。
2. hang on to 长时间保留；保存；
例句：Hang on to your present job until you find a better one.
继续做你现在的工作，直到找到更好的。
3. instead of 代替…；而不是…；
例句：Instead of working, Jack was idling away his time.
杰克不去工作，虚度着光阴。
4. as if 好像；仿佛；
例句：As if unsure of where she was, she hesitated and looked round.
她彷佛茫然不知身在何处，犹犹豫豫向四周打量。
n. 方言
