The Boeing 767 had barely taxied to a halt before its doors were flung open...这架波音767刚刚停住，它的舱门就弹开了。The plane taxied / was taxiing along the runway.飞机在跑道上滑行.The engine note changed as the aircraft landed, taxied and halte...
通过环氧化和氧化就得到外消旋的含十八个碳的昆虫返动激素.Epoxidation and oxidation gave the racemic C 18 - juvenile hormone.发现旋光基质有外消旋作用.Racemization is found with optically active substrates.外消旋体是不旋光的.The racemate is optically inactive....
He was a tubby little man in his fifties, with sparse hair.他50来岁，头发稀疏，身材矮胖。He was short and tubby and amiable with an odd little toothbrush moustache.他矮矮胖胖,和蔼可亲,留了一嘴怪模怪样的牙刷式的小胡子.Tubby body obesity, forehead, head cephali...