托福写作：加分句之同位语从句
Eg: It is an undeniable fact that environmental pollution becomes increasingly serious.环境污染变得越来越严重是不可否认的事实。Eg: No one can deny the basic fact that it is impossible for average workers to master those high-technology skills easily.
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。
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