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...
The jockey pulled the horse up at the top of the homestretch.赛马师把马停在赛道的最上方.El Guerrouj took the lead after 900 m and stayedahead until the homestretch.埃尔?盖鲁伊在900米后就取得领先位置直到最后冲刺阶段.The horse forged ahead the lead in the ho...
They're asked to make objective, in inverted commas, evaluations of these statements.他们被要求对这些陈述作所谓“客观”的评价。Only direct speech should go inside inverted commas.只有直接引语应放在引号内。Use commas to separate multiple properties o...
Just before the town boundary fork left onto a minor road.快到城镇边界时要走岔路的左边一条小路。The ball was caught by a fielder standing just inside the boundary.那个球被正站在边界内的守场员接住了.A river forms the boundary between the two countries.一条河流成...