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...
The knee's coming on fine, I'm walking comfortably already.膝盖恢复得很好，我现在走路已经不疼了。He was comfortably seated in a soft reclining chair.他舒舒服服地坐在柔软的躺椅上。Take a comfortably wide stance and flex your knees a little.双腿适度分...
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...