Crossing over The exchange of material between homologous chromatids by the formation of chiasmata.交换:同源染色单体之间形成交叉时遗传物质的交换现象.The exchange of prisoners of war was one of the key elements of the UN's peace plan.交换战俘是联...
This could intensify the risk of a nuclear exchange.这可能会加剧爆发核战争的危险。During the turmoil in the foreign-exchange markets the guilder remained strong.荷兰盾在外汇交易市场的动荡中保持坚挺。They exchange traveller's cheques at a different r...