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noise-free technology Sound is radiated both as air-borne and as structure-borne; most sources produce both, thus various noise attenuation principles must be employed. Measures include: the replacement of components with quieter parts and material; the enclosure of particularly noisy components; the selection of quieter types of fan; the replacement of noisy compressed-air nozzles with quieter types; the choice of quieter transmission and cooling systems
environ.	无噪声技术 (声音可同时作为空气传播和结构传播；大部分的传播来源同时产生，因而不同的噪音衰减原则须得到使用。措施包括：用消音零件和材料更换部件；隔绝特定的噪声部件；选择消音风扇；用消音类型更换噪音压缩空气喷嘴；选择消音传输和散热系统。)