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....
I've never seen Terry laugh so hard...我从未见过特里如此放声大笑。Terry intuitively reciprocates and becomes frustrated and conflicted by his decidedly unprofessional feelings for her.特里也直觉地感到了这一点,而且为自己这种显然非职业的情感感到沮丧和矛盾.Millson s...
Novello says college students will spend $4.2 billion yearly on alcoholic beverages.诺韦洛说大学生每年在酒精饮品上会消费掉42亿美元。Businesses need to train their workers better, and spend more on R&D.各企业需要更好地培训工人，并且在研发方面加大投入。They will then ha...
It is a tedious, humourless load of crap.那是一堆枯燥乏味、毫无幽默感的废话。He showed his teeth in a humourless grin.他一本正经地咧嘴笑了笑。He was a straight-faced, humourless character.他是个一脸严肃相、缺乏幽默感的人。...
大多数呼吸道感染都如此,如支原体感染, 传染性鼻炎, 喉气管炎.This applies to most respiratory infections ( e . g . mycoplasma infections, infectious coryza, laryngotracheitis ).目的: 探讨支原体对人类孕育的影响.Objectives: To properly understand the influence of my...
He had always wanted an adventurous life in the tropics.他一直想到热带地区过冒险的生活。The menu could have been more adventurous.菜单本可以做得更有新意。For the more adventurous tourists, there are trips into the mountains with a local guide.对更愿猎奇...