Clearly, this retroviral gene fills an important niche in mammalian biology, but, on the other hand, mammals were able to reproduce perfectly well before they were first infected.

显然，这种逆转录病毒基因填补了哺乳动物生物学的一个小生境，但是从另一方面来说，在第一次感染此类病毒以前，哺乳动物已经能够完美的生殖了。

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The makers claim that a CD can reproduce the original sound perfectly, without any distortion or background hiss.

制造商宣称这种唱片能够完美地再现原声，不会失真，也不会带有任何伴随的嘶嘶声。

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Physics-based simulation of elastic-plastic deformation using physics theorem in the real world can perfectly reproduce the real movement and realistic deformation of virtual objects in virtual space.

基于物理的弹塑体形变模拟采用真实世界中的物理学定理可以完美重现虚拟物体在虚拟的空间中真实的运动过程及逼真的形变。

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Clearly, this retroviral gene fills an important niche in mammalian biology, but, on the other hand, mammals were able to reproduce perfectly well before they were first infected.

ECONOMIST: A virus has been subverted into helping its host

"We know that animals in 'germ-free' conditions can reproduce, they have a longer lifespan, and they seem to live perfectly OK, provided you don't expose them to stress or damage, " said Sven Pettersson, the Karolinska Institute microbiologist who, along with neuroscientist Rochellys Diaz Heijtz, led the research.

BBC: Bacteria in mouse gut affect development and behaviour