方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.METHODS: The target compound was prepared by the bromination and amination reaction.论述了三丙酮胺纯度对加氢和还原胺化反应的影响.The effects of triacetoneamine concentration on hydrogenation and amination were discusse...
I often bumped into him as he padded the corridors.他在走廊里轻轻地走过时，我常常碰见他。The corridors there were painted chocolate-brown to shoulder height.那里的走廊从地面到齐肩高的部分都漆成棕褐色。The corridors are carpeted in tartan.走廊里铺的是花格地毯。...
Herbs have been used for centuries to endow a whole range of foods with subtle flavours.数个世纪以来，香草一直被用于给各种食物增添淡淡的香味。The polyphonic features endow Light in August with eternal vitality.复调性赋予《八月之光》不息的生命力.Ramon had managed t...
He wonders if the different influences might not cancel each other out.他在想，各种影响能不能相互抵消。He had to cancel some engagements because of tiredness.他太累了，不得不取消一些约会。The band was forced to cancel a string of live dates.乐队被迫取消了一系列...
Some secretarial experience and a cooperative personality are musts.须略具秘书经验、个性合作.The two musts speaks for the far - reaching historical experiences in China.摘要“两个务必”凝结着深刻的历史经验.I have a shopping list of absolute musts.我要求...