The problem is that the students prepare to set only one set of new supply to be purchased. To solve the problem by giving parents an existing product from home to the workplace and the other problem is that the drinking water in the workplace is not clean. Drinking water of 600 employees will be dark-skinned man, sedimentation, it is some drinking, but most will buy the water itself, the hotel employee outside the hotel at the time prohibited work, and even a store front. Therefore, it must buy bottled water which is quite expensive.
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