451. It is fairly well-known that... However, it is less known that...

英语四级译文:
...，这是为人们所熟知的；但是，人们却不大清楚...

四级词汇讲解:
本句型可以用于各种文体中，说明两种完全不同的情况，通常用在文章的中间部分。fairly在此意为“相当地”。如:
It's fairly hot today.今天相当热。

其中，fairly可以替换为其他副词。如:quite, extraordinarily等。本句型中所需替换的部分为that引导的表语从句。

四级句型拓展:
※ It is quite weld-known that entering WTO brings us many profits. However, it is less known that many domestic companies are facing great challenges and serious problems at the same time.
人们都熟知，加入世界贸易组织给我们带来了很多好处。但是，人们不太了解，加入世贸组织之后，很多国内的公司都面临巨大的挑战和严峻的问题。
※ People know it well that entering WTO brings us many profits. However, they have little idea that many domestic companies are facing great challenges and serious problems at the same time.
人们清楚地知道，加入世界贸易组织给我们带来了很多好处。但是，他们不知道的是，在获得利益的同时，很多国内的公司面临巨大的挑战和严峻的问题。