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Problem: Even for a strong young man, it is not a easy task to raise up a pail of domestic drinking water, which has a weight of about 19.5 kg. Obviously, it is harmful for our spinal column.
Solution: This new kind of pail is divided into 4 parts equally. Thus, we only need to raise up a quarter of the weight at a time, and finish the task by raise the quarter-pails for four times. Although we need to raise three more times, for each time the pressure on our spinal column is much less than before.
Shanghai Maritime University