Getting enough vitamins is essential to life. 解析:这句话简化之后就变为A is essential to life. 注意一下:A is essential to B的意思是:A对于B 来说很必不可少。 A所代表的这个Getting enough vitamins中通过它出现的位置是主语的位置,就确定了其名词的身份,再通...
to quickly zero in on its prey has always impressed scientists. But it took a detailed study by Duke University marine biologists S. A. Wainwright, F. Vosburgh, and J. H. Hebrank to find out how the sharks did it. In their study the scientists obse...
更多内容请点击：2015年考研起步英语名词性从句全解析