“考证”造句
由于年代久远,其渊源已无法
考证.
It has an origin lost in the mists of antiquity.
我不知道这则旧传闻的出处，我从来没能
考证出结果。
I don't know where that old story came from, I've never been able to track it down.
博物学中虽然有许多类似的假设，却从没人对此
考证过。
But as with many such suppositions in natural history, no one had ever tested it.