pneumatic cylinder是什么意思

英语翻译
A pneumatic drop with a manual shutoff valve and regulator for the air connection must be installed.

请问这句话怎么翻呢
Where fitted,hydraulic,
pneumatic,spring-loaded or mechanical door closing mechanisms shall be
capable of maintaining doors in the closed position while the vehicle is subject to forces normally experienced in transit.

The compatibility of pneumatic equipment is the responsibility of the person who designs the pneumatic system or decides its specifications.

英语翻译
The combination of an air hose hanger and a pneumatic tool,comprising:a flexible tubular air conduit a pneumatic tool connected to one end of said conduit and suspended thereby,the connection between said pneumatic tool and said conduit providing for communication between said conduit and said tool,the other end of said conduit being connected to a fixed support and adapted to communicate with an air pressure supply; said conduit having a closely coiled helical shape and being of an elastic material having a per-shaped elastic memory of sufficient resistance to separation of said coils to lift said tool.
做专利用的,麻烦给翻译一下.

英语翻译
the pneumatic system supplies hot high pressure air to the systems on the airplan that ues air.these are the sources of pneumatic power.engine bleed air---APU

一段英语的翻译
The pneumatic nutation motor has been developed as a lowspeed and high torque motor with stepping motion [1]. Fig. 1 shows the general relative motions of a pair of cone- and cupshaped objects, A and B, which roll over each other without slipping. This relative motion between two objects is called “nutation” in which one object tilts and rotates to the other. Nutation motor utilizes this motion to realize high torque.

英语翻译
Where fitted,hydraulic,
pneumatic,spring-loaded or mechanical door closing mechanisms shall be
capable of maintaining doors in the closed position while the vehicle is subject to forces normally experienced in transit.