不过，雾和霾还有本质上的区别。
它使科学家转移基因不会混种本质上的区别种类之间。
It enables scientists to transfer genes between different species that would not interbreed in nature.
恋爱与结婚还是有着本质上的区别，婚姻意味着责任。
Love and marriage still has a fundamentally different, marriage means that duty.
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