It's not just dropping food on the floor that can lead to bacterial contamination.
2
看起来问题的焦点不太在于你的食物在地上停留的时间长短，而更在于那块地被细菌污染到了什么程度。
It looks like what's at issue is less how long your food stays on the floor and much more how contaminated with bacteria that patch of floor happens to be.
3
由于医疗器械通常用于免疫系统处于非最佳状态的人，所以它们受细菌污染的问题就显得尤为突出。
Bacterial contamination of medical devices is a particular problem, as those devices are then used on people whose immune systems may be in less than tip-top condition.
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