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重點講解：
1. back and forth
來回；往返；
eg. The prosecution and defense were bandying accusations back and forth.
原告和被告你來我往，互相指責。
eg. He rocked back and forth in his rocking chair.
他坐在搖椅里前后搖晃著。
2. look at
（以某種方式）看，瞧，望；
eg. Please raise your head and look at the blackboard.
請抬起頭來，看黑板。
eg. Don't look at me like that.
別那樣看著我。
3. put back
放回原處；
eg. The girl put back the doll.
女孩把娃娃放回原處。
eg. When the others had gone mary remained and put back the furniture.
當其他人走了之后瑪麗留下來將家具放回原處。
n. 防衛，防衛物，辯護
vt. 防守
