Jack:I have invented a new drug which could kill lice effectively.
Tom:That's wonderful. How is it used?
Jack:When you catch a louse, just put a little of that drug on its mouth and it will die immediately.
杰克:我发明了一种新药能有效地杀死虱子。
汤姆:太棒了。怎么用呢？
杰克:你捉到一只虱子，只要在它嘴上抹一点这种药，虱子就会死去。

这个方法，很有创意。哈哈。。。

该药的效果，在于使用方法的得当。