grating-ruling engine 光栅刻线机
engine-room grating 机舱格栅
engine and boiler grating 机炉舱格栅
grating dividing engine 光栅刻线机
diffraction grating ruling engine 衍射光栅刻划机
·2,447,543篇论文数据，部分数据来源于NoteExpress
It's not terribly grating, especially once you start hearing some engine noises, but it is noticeable.
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