noiseless
adj. 无声的；寂静的
例句
He moved with noiseless steps.
他脚步轻轻地走动。
《牛津词典》
The snow was light and noiseless as it floated down.
雪花静悄悄地轻轻飘落下来。
《柯林斯英汉双解大词典》
Adopting air-controlled positioning, noiseless and easy for maintenance.
使用空气缸定位，无噪音，易于保养。
