我们想知道食物与被污染的表面接触的时间长短是否会影响细菌转移到食物上的速度。
We wanted to know if the length of time food is in contact with a contaminated surface affected the rate of transfer of bacteria to the food.
五分钟后，我们将培根或面包放在表面5秒、30秒或60秒，然后检测转移到食物上的细菌数量。
Five minutes after that, we placed either bacon or bread on the surface for 5, 30 or 60 seconds, and then measured the number of bacteria transferred to the food.
当这些表面和磁铁矿一接触，氧原子就能从石英砂转移到磁铁矿，形成了一种新的矿物，赤铁矿。
When these surfaces came into contact with the magnetite, an oxygen atom could be transferred from quartz to magnetite, forming a new mineral, hematite.
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