碳的诸多同位素the many isotopes of carbon碳的化合价是4价。Carbon has a valency of 4.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....
It is simpler and quicker to use than conventional methods.这比通常的做法更简单、更快捷。Make the extra effort to impress the buyer and you will be rewarded with a quicker sale.多用心去打动顾客，货物就会更快售出。"There are trains straight from Cambridg...
Eyewitnesses spoke of rocks and shards of glass flying in the air.目击者称空中石块和玻璃碎片四溅。Ward, Josh Billings , and a host of others have survived only in scattered shards of humour.沃德 、 比林斯和许多别的作家能够留传下来的只是些幽默的残章断简.How would you...
家人为他起的广东话绰号意思是NeverSitsStill（从来坐不住）。His family's Cantonese nickname for him translates as Never Sits Still.除了广东话,我还能讲上海话.I can speak Shanghai dialect other than Cantoness.可是跟当地说广东话的人交谈我感到有一点困难.But I feel a little bi...
Speech in this circle, if not always decent , never became lewd.这个圈子里的谈话, 即使不总是正经的, 也绝不会是下流的.But his supervisor was among those making the lewd and degrading comments.但他的上司也是这些满口污言秽语的骚扰者之一,而人事经理也无能为力.Lewd conduct is not ...