Germ-free mice spent more time roaming about an open arena than other mice did.

无菌鼠比另一老鼠会花费更多的时间游荡在空闲区域。

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Even though your office desk looks clean and tidy, that does not mean it is germ-free.

即使你的办公桌看起来干净整洁，也并不意味着办公桌没有细菌。

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Some hotel chains are already pledging to keep their properties a little more germ-free.

一些连锁酒店已经许下保持环境无菌的承诺。

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But perhaps the most bizarre items are anti-bacterial plastic maracas for that germ-free salsa experience.

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Researchers then transferred samples from the guts of the three groups of mice into other germ-free mice.

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They found that colonizing an adult germ-free animal with normal gut bacteria had no effect on their behavior.

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