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.
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。
Moreover, it is hard to imagine a system in which individuals must give permission each time a friend wants to transfer their contact details.
此外，一个每次都需要许可才可以传输朋友联系信息的系统也令人难以想象。
Because the hot air makes full contact with the materials, which enhances heat transfer and mass transfer; so that the materials can be dried in a relatively short time.
由于热风与物料广泛接触，增强了传热传质的过程，因此在较短时间内就可干燥。
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