新概念英语94课they should encourage those among us who cannot swim five yards before they are ……

新概念英语94课they should encourage those among us who cannot swim five yards before they are ……

题目
新概念英语94课they should encourage those among us who cannot swim five yards before they are ……
Meanwhile,they should encourage those among us who cannot swim five yards before they are gasping for air.我想问一下should和before在这个句子中怎么解释.
答案
同时,我们应该鼓励我们当中的那些游不到五码就必须出来透口气的人.
should应该;before在……之前
who cannot swim five yards before they are gasping for air是定语从句,修饰those.
gasp后为什么加for?表示目的.gasp,喘气,透气,喘气的目的是吸入空气.
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