The team'stereoisomerism " however, is generally restricted to mirror image isomerism.然而 “ 立体异构”一词通常只限于镜象异构.A rather more complex case is that of steric isomerism.更复杂的情形是立体异构问题.It realized the isomerism form to have...
取120个值计算平均数。Take a hundred and twenty values and calculate the mean.把它们相加再除以5就是平均数，明白吗？Add them together, divide by five, and you've got the average. Okay?在新英格兰人们的收入通常比全国平均数低10%.Income in New England is commonly 10 ...
在桌上的书堆中间有本皮面装订的小书.Among the books on the table was a small one bound in leather.这本小书是他法文课中用来引起学生兴趣的花样.This little book is the window dressing for his French course.我们阅读了故事小书上的这一则:复活节-寻蛋游戏.We read about the Easter Egg Hun...
There the irrigation canal links up with the reservoir.这条灌溉渠在那里与水库连接起来.Irrigation is easy in the South because of the abundance of water.南方多水,利于灌溉.Irrigation is needed to make crops grow in dry regions.干旱地区需要灌溉才能使作物生长....