Rescuers were still working their way towards the trapped men.营救人员仍在艰难地向被困者靠拢。It took rescuers 90 minutes to reach the trapped men.营救人员花了90分钟才赶到被困者那里。They were trapped after the lifts went out of action.电梯出现故障,他们被困在里面了。...
The acid ewolises nearly as well as the ester.此酸的烯醇化几乎象酯一样良好.Diphenyl carbonate shows a typical vinyl ester effect.碳酸二苯酯表现典型的乙烯的酯类的效应.Ester is one of the most important compounds in Organic Chemistry.酯是有机化学中最主要的化合物之一....