在特殊的酸催化中, 不离解的酸不起作用.In specific acid catalysis, the undissociated acids do not contribute.所有的原子和分子系统都受光致电离和光致离解的影响.All the atomic and molecular systems are subject to photoionization and photodissociation.后者是由二氧杂环戊烷中活化较弱...
September is here, bringing with it a chill in the mornings.9月到了,早晨已有了寒意.The South African mailboat arrived on Friday mornings unless bad weather intervened.除非受恶劣天气干扰,南非邮船一般在星期五上午抵达。In the mornings the sky appeared a hea...