2017届高考英语一轮复习教师用书：必修4（外研版）_高考复习指南

　　跟别的动物一样，我们会一直处于戒备状态，直到我们感觉安全了才放松。

　　on (one's) guard against　戒备；防备

　　off guard

　　不警惕；不提防

　　①When we go shopping, we should be on guard against pickpockets.

　　当购物的时候，我们应该提防扒手。

　　②Don't be off guard! You mustn't tell anything to him.

　　不要放松警惕，你一定不要告诉他任何事情。

　　2．hold up支撑；承受住；延迟；阻碍；举起

　　[教材原句]　One person then holds up his hand, palm outwards and five fingers spread.

　　然后一个人举起他的手，手掌向外，五指展开。

　　[一词多义]　写出下列句中hold up的含义

　　①Had it not been for the postal strike, my home letter might not have been held up.延误

　　②How does he hold up under such a responsibility？承受住

　　③They held up their coach to celebrate their winning.举起

　　④This old tree is held up by a post.支撑

　　hold on　挺住；坚持住；(打电话)别挂断

　　hold on to

　　抓紧；不放开；保留；坚持

　　hold back

　　阻挡；拦阻；隐瞒；控制

　　hold out

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