创造性的广告并非定是不好或具有破坏性的,相反, 它符合时代进步的要求.Creative advertising need not be bad or destructive , but rather it can be contemporary.如果岩石是松散的或具有润滑面, 它们就是不稳定的或轻微分解的岩石.If the rock disaggregates or yields greasy sufaces, it is an uns...