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此外、明智的炸药用户还须知道不同的结构、公用设施、设备和用具对振动感度的变化、而且要记录爆破场地附近的情况
expl.	Also, the explosives user would be wise to become aware of the variation in vibration sensitivities of different structures, utilities, facilities and materials, and to make note of the conditions near his operations