careless working是什么意思

用法例句

This paper reviewed the related domestic and abroad research achievements and details about how human activities such as grassland reclamation, over-grazing, excessive digging resulted in grassland desertification.

综合了国内外的研究成果,详细说明了草原荒漠化的人为主要原因———开垦草原、过度放牧、滥采滥挖是如何导致草原荒漠化的。