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...
Between the Roman colon - us and the new bondsman had stood the free Frankish peasant.介于罗马隶农和新的农奴之间的是自由的法兰克农民.A bondsman is needed in executing a student loan.办理助学贷款是需要担保人的....
象用其强有力的臼齿嚼碎食物。The elephant grinds its food with its powerful molars.“ 用精选的真人臼齿做的. ” 他告诉我." Finest specimens of human molars, " he informed me.象用其强有力的臼齿嚼碎食物.The elephant grinds its food with / between its powerful molars....
The dredger spooned up mud.挖泥船把泥挖起来.Back of the breakwater the dredger was working.在防波堤后面挖泥船正在工作.The slurry pump is one of the key facilities of a dredger.泥泵是水力输送式挖泥船的关键设备....