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...
上星期,他因出现肺萎陷而被火速送进医院。He was rushed to hospital last week after suffering a collapsed lung.血胸: 各种原因所致的胸膜腔内积血、肺萎陷称为血胸.Hemothorax: accumulation of blood the pleural cavity thethe lungs and the walls of the chest....
A series of mischance happened.一连串不幸的事发生了.I lost your file by pure mischance.我把你的文件丢了,纯粹是碰上倒霉事了.It's an infernal mischance; I've done my best to discourage it.这真是倒楣透顶的事; 我尽量地泼冷水....