词汇辨析-beforehand和previously,ahead的区别

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词汇辨析-beforehand和previously,ahead的区别词汇辨析-beforehand和previously,ahead的区别词汇辨析-beforehand和previously,ahe

词汇辨析-beforehand和previously,ahead的区别
词汇辨析-beforehand和previously,ahead的区别

词汇辨析-beforehand和previously,ahead的区别
beforehand [ bi'fɔ:hænd ] ..
ad.预先,事先
previously [ 'pri:vju:sli ] ..
ad.以前(预先)
ahead [ ə'hed ] ..
ad.向前地,胜于,在...前面