Although it's impossible to keep your hands germ-free, washing your hands frequently can help limit the transfer of bacteria, viruses and other microbes.
虽然不可能让你的手保持零细菌，但是勤洗手可以帮助你限制细菌、病毒和其它微生物的转移。
2
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。
3
Keep your kitchen sponge or cloth germ-free by microwaving it on full power for 2 minutes daily.