第401句
It is fairly well-known that... However, it is less known that...
译文：…，这是为人们所熟知的；但是，人们却不大清楚，…
点睛：本句型可以用于各种文体中说明两种完全不同的情况，通常在文章的中间部分。fairly在本句型中作副词，意为“相当地”。
It's fairly hot today.今天相当热。
本句型中的fairly可以替换为其他副词，如：quite，extraordinarily等；所需替换的部分为that引导的宾语从句。
句型拓展：
*It is quite well-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.
人们都熟知加入世贸组织给我们带来了很多利益。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着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利益。但是他们不知道，在获得利益的同时，很多国内的公司也面临着巨大的挑战和严峻的问题。