赛前他状态很好，赛后就筋疲力尽了。Before the race, he is fine. But afterwards he is worn out.比赛前每个人都亢奋起来，开始大声喊叫着为自己打气。Before the game everyone gets psyched up and starts shouting.比赛前，他显得镇定而自信。He appeared relaxed and confident before the ...
A new method for separating and purifying p - AAB ( p - aminoazobenzene ) by dry - column chromatography is developed.提出了一种干柱层析法 分离提纯 试剂对氨基偶氮苯的新方法.The present invention provides membrane separating and purifying process ...