穿过地理梯度, 莱文斯预料有分布区不重叠的小种或近群种.Across geographic gradients, Levins expects allopatric races or coenospecies exist.航空磁梯度仪在六十年代中期交付使用.The airborne magnetic gradiometer came into use in the middle 1960 s.这说明水动力条件具有很明显的位能梯度.Thi...
Cupric azide is insoluble in water.叠氮化铜不溶于水.Guanyl azide is then isomerized to aminotetrazole.随后,叠氮化脒异构化生成氨基四氮杂茂.It is possible to harness the versatile chemical properties of cyanogen azide.氰化叠氮的灵活多变的化学性质是可控制的.Silver az...
过来吧，好多老朋友都在这儿。Come on over, we've got lots of the old gang here.我们在村里偶然碰见了一些老朋友。We ran across some old friends in the village.你总不会对老朋友见死不救吧？You wouldn't leave an old friend in the lurch, surely?...