科研之友
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摘要
<正>One day,a Frenchman(法国人)goes to see his friend.His friend is an Englishman.The Englishman has a big dog.The dog barks(叫)at the Frenchman.The Frenchman is scared(害怕的)."Don’t be afraid,"the Englishman says."Do you know:Barking dogs don’t bite(爱叫的狗不咬人)?""Oh,yes,"answers the Frenchman."I know it,and you know it.But...the dog...does he know it?"
