Someunwelcomevisitor的精选

问题详情：SomeunwelcomevisitorsfromNorthAmericahavebeenturningupinthewatersoffthecoastofGreatBritain.   NorthAmericanlobsters(龙虾)havebeenfoundintheNorthSea(betweenGreatBritainandNorthwestEurope),fa...