例文
- Designed to work in line with high speed, automatic packing machines, the new GRS models are powered by multi-step motors instead of air pistons.
- To permit adjustment though, the steam piston rod only goes as far as the crosshead and above this there are twinned rods to the air piston.
- Most of the systems have been simplified and streamlined; with the help of air pistons, beds now glide from cabinetry instead of whomping down with a comic twang.
