The latter arises from abstraction of the somewhat lesser activated C - H bond in the dioxolane.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.Twisting arises in boards through the presence of spiral or interlocking grain.翘曲多发生在螺旋或交错纹理的板材...
Having identified the problem, the question arises of how to overcome it.发现问题后，如何克服它的问题又出现了。Any unexpected circumstance that arises may catalyze a sudden escalation of violence.任何突如其来的情况都可能造成暴力骤然升级。This type of inefficie...