第四, 同位语从句。 Eg: It is an undeniable fact that environmental pollution becomes increasingly serious. * `* |- Y6 e. S/ s$ @( K0 r 环境污染变得越来越严重是不可否认的事实。, }# r2 N2 O M- v+ R
Eg: No one can deny the basic fact that it is impossible for average workers to master those high-technology skills easily. 0 z5 |( l) Y; L+ k/ p( [( Y% ]$ x/ w 没有人能否认这一基本事实:对于一般工人来讲,轻松掌握这些技术是不可能的。