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it’s a school. 2. Like other animals, we are on guard until we know it is safe to relax. 我們感覺到很安全才會放松 , 否則將一直 處于戒備狀態(tài) . be on guard 有警惕 ,心存戒備 3. If our right hand is busy greeting someone, it cannot be holding a weapon. 如果我們的右手忙著和別人打招呼 , 就不可 能握有武器了 . be busy doing sth be busy with sth 忙著做某事 . , it is quite a mon greeting. 現(xiàn)在 , 它是一種很常見的打招呼方式 quite 通常放在冠詞 a/an 的前面 quite a . . aggressive, deal, gesture, greet, formal, informal, position, trust, unconscious, weapon 1. Guns and knives are two different types of ____. 2. Someone who has a(n) __________ attitude may be violent. 3. You can ______ someone by saying “hello” 4. Your ______ is the way you are sitting or standing. 5. If you are _________