The American and Japanese navies took the lead in the development of naval aviation...美国和日本海军是发展海军航空部队的佼佼者。The Wright brothers pioneered in early aviation.莱特兄弟是早期航空的先驱.The Gossamer Conder, a human - powered airplane, fle...
他中学时不擅长代数.He was not good at algebra in middle school.在代数里, 符号X常用来表示未知数.In algebra, the sign X usually denotes an unknown quantity.他的同学们正在绞尽脑汁地演算初等代数题.His classmates were labouring with elementary algebra....
灰鲸们要游到几千英里以外去寻找温暖 、 食物和日光.Gray whales travel of miles seeking warmth, food and sunlight.母灰鲸带着三个月大的幼鲸游向食物丰富的海域.Mother Grey whale and its three - month old baby heading for feeding area....