He hunted vainly through his pockets for a piece of paper.他翻遍口袋想找一张纸，结果没找到。The criminals vainly sought concealment from the searchlight.罪犯们徒劳地躲闪着探照灯光。He shouted after them, vainly trying to attract their attention.他在他们的后...
The general condition is bettering instead of worsening.一般的情况不是在恶化而是在好转.He had dedicated his life to bettering the lot of the oppressed people of South Africa.他毕生致力于改变南非受压迫人民的命运。He recorded a time of 4 minutes 23, better...
泥质沉积物沉积后, 体积的70-80%是水.When deposited , 70 - 80 % of the volume of muddy sediments may be water.河床沉积物一般比邻近的泛滥平原沉积物粗些.Channels generally contain coarser sediment than do the adjacent flood plains.这些气体包括窜缸气体, 沉积物, 酸, 机油和其它杂...