as it has come to be known 是一个插入语,或称作评注性状语从句,as是“与.一样”的意思.
正如已经为人们所熟悉的那样,洞穴勘察（人们已经熟悉了这个词语）是一项较新的运动.
若这里的as理解成“当”的意思,就成了时间状语从句了,那么它的位置要么在前,要么在后,不会放在中间的!
“cave exploration ,as it has come to be known ,is a relative
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