But animals swapping dna directly with oneanother is previously unheard of .

然而不同种动物之间直接交换dna则是闻所未闻。

If gut bacteria are making you ill , can swapping them make you healthy ?

如果肠道细菌使你生病了，那么交换掉它们能使你重获健康吗？

Exxon , in contrast , is neither swapping shares nor violating any previous agreement .

相反，埃克森则没有交换任何股份或违法任何先前的协议。

The internet lets parents discover teaching materials and communicate with each other , swapping tips online .

家长能够在因特网上找到教学资料，还可以在线相互交流、交换意见。

Many users of these sites think they are swapping , not stealing , material .

许多这些站点的用户认为他们是在交换而非偷窃资料。