排气中最大量的排放物是在怠速和低速运行时产生的.The greatest amount of exhaust emissions are produced at idle and during low - speed operation.澳大利亚的野生动植物也遭受到汽车有毒排放物的侵害.The Australian wild life also suffers from the cars'toxic emissions.所有汽...
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....