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 ma...
I didn't count on his capsizing the raft.我没有想到他会把筏子弄翻。Cutting - axle fracture are primary causes of wagon capsizing.切轴断裂是造成铁路车辆重大倾覆事故的主要原因.The uncertain theory is used in this paper to study the problem of capsizing...