例句與造句

1. Directed by rack and guide rail which are fixed on the base , the traveling part of milling mechanism is drived by motor through feed change unit
   同時，帶動行走部分的大多是絲桿螺母機構(gòu)，滾珠絲桿等，而光桿和齒條齒輪機構(gòu)均為導(dǎo)向定位作用。
2. It's difficult to find feed change in a sentence. 用feed change造句挺難的