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The “five-second rule” is a common belief about the safety of eating food that has fallen to the floor. The rule suggests that the sooner you retrieve the dropped food, preferably within five seconds, the less likely it is to pick up bacteria. However, can a mere five seconds truly __1__ food from the bacteria present on the floor?
That knife is made of stainless steel.
那把刀是不鏽鋼製的。