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问题: 为什么只能用as,不能用which?

"Bungee jumping", as it is known, has become very popular in the USA.

也不算是顺承关系吧,为什么只能用as,不能用which?

解答:

as it is known 在句中作插入语.插在主谓之间.固定搭配:as it is known to us all.
翻译为:众所周知.
用which的话,引导的是非限制性定语从句.也必须去掉it
不符合句意.