Jay had always tended to keep his girlfriends at a distance.杰伊一贯和他的女朋友们保持距离。He stares detachedly into the middle distance, towards nothing in particular.他漠然而漫无目标地注视着不远处。By half distance we held a comfortable two-lap lead...
很多环戊烷的衍生物在这个范围也出现吸收.Many cyclopentane derivatives also absorb in this region.后者是由二氧杂环戊烷中活化较弱的C -H 键离解而产生的.The latter arises from abstraction of the somewhat lesser activated C - H bond in the dioxolane.控制缩合反应的温度,还得到一种苯并环...