胆石通常是在胆囊中形成的.Gallstones usually form in the gall bladder.胆石症是由胆汁的成分形成的.Gallstones are formed from the constituents of bile.胆石症的发病率随年龄而逐渐增高.The incidence of gallstones increases progressively with age....
The publisher expected the book to sell 1,500 copies, tops.出版商预计该书至多能卖出1,500本。The tops of the trees rippled in the breeze.树冠在微风中婆娑摇曳。Wires criss-cross between the tops of the poles, forming a grid.电线杆顶端的电线相互交错，形成电线网。...