METHODS: The target compound was prepared by the bromination and amination reaction.方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.The effects of triacetoneamine concentration on hydrogenation and amination were discussed.论述了三丙酮胺纯度对加氢和还原胺化反应的影...
After the Norman Conquest the forest became a royal hunting preserve.诺曼征服之后，这片森林成为了皇家狩猎区。The park was created to preserve some of the forests upstate.这个公园是为了保护该州最北部地区的一些森林而建的。Bad driving is not just the preserve of boy r...
很难找到解决这些问题的巧妙办法。Neat solutions are not easily found to these issues.他对语言的误解是引起其他问题的主要原因。His misunderstanding of language was the primary cause of his other problems.婚姻中有一些公认的容易引发问题的雷区。There are recognised black spots in ...
残骸上燃烧着的硫黄迫使人们撤出该地区。Burning sulfur from the wreck has forced evacuations from the area.含硫化合物的名称前通常有前缀thio。Sulphur-containing compounds are often prefixed by the term "thio"硫也可用来给器材消毒。Sulphur is also used to sterilize equi...