Most bats navigate by echolocation.大多数蝙蝠靠回声定位来飞行。Most bats produce echolocation sounds by contracting their larynx.大多数蝙蝠通过收缩喉咙所发出的声音实现回声定位.Some bats have specialized structures for emitting echolocation calls.一些蝙蝠已经把用于发出...
Down below them was the sea of upturned faces.他们下面是无数张仰望的脸。He clung to the upturned boat, screaming for help.他紧紧抓着住倾覆的小船，高呼救命。He came into the room, his overcoat collar upturned.他进屋时大衣领子向上翻起....
The army claims the rebels are on the ropes.军队声称叛军支撑不了多久了。Steel cable will be used to replace worn ropes.将用钢缆替换磨损的绳索。With perfect synchronization, two other girls cartwheeled toward the ropes.另外两个女孩同时朝着绳索做侧手翻，动作整齐划一，完美无瑕...
He warned that the effects of any war would be incalculable.他警告说任何战争造成的后果都是不可估量的。This has done incalculable damage to his reputation.这给他的声誉造成了难以估量的损失。The oil spill has caused incalculable damage to the environment.这次石油泄漏...