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1·They moved with absolute noiselessness.

他们绝对无声地移动。

2·The fanless design ensures complete noiselessness and maintenance-free operation.

无风扇设计，无噪音维护便捷。

3·With brand new design, noiselessness and excellent quality in the welding spot, the welder is able to precisely control the welding energy.

设计新颖，能精确控制焊接能量，无噪音，焊点质量好。