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...
“首府”的英语可以翻译为:[旧] (省会所在地) the prefecture where the provincial capital is located,(自治区、自治州政府所在地) the capital of an autonomous region or prefecture,(附属国、殖民地最高当局所在地) the capital of a dependency or colony,capital,metropolis ...
有些使用过的人认为应把围篱埋入土中30厘米.Some practitioners advise sinking the fence netting 30 centimetres into the soil.他在围篱外把游泳裤穿上系紧.Beyond the hedge he pulled on his trunks and fastened them.围篱必须是牢固耐用的.Fences must be sturdy, tight....