他的理论是，随着船只的使用，人们沿着因海平面下降而暴露的大陆架逐渐移居到未冻结成冰的区域。
He theorized that with the use of watercraft, people gradually colonized unglaciated refuges and areas along the continental shelf exposed by the lower sea level.
现在我们对一架飞机的安全有了一个未解决的疑问。
We now have an open question about the safety of one airplane.
他一生中驾驶过上百架飞机，可是从来未遇到过一架这样无与伦比的飞机。
He had piloted as many as a hundred aircraft without encountering one of these unique planes.
应用推荐