The days of the dutiful wife, who sacrifices her career for her husband, are over.贤妻为了丈夫而牺牲自己事业的时代已经结束了。During that period they fasted, made many sacrifices, and avoided unnecessary work.在这期间,他们禁食, 举行了很多献祭, 避免不必要的工作.Sacr...
A hydrocarbon was known to be either an alkene or alkane.某碳氢化合物已知可能是烯烃或是烷烃.The hydrocarbon must be an alkene.这个碳氢化合物必定是烯烃.The betaine will collapse to the alkene only when these two functions are eclipsed.只有当这两个基团移至重迭位置时...