在有座舱增压的飞机上，座舱空气的分配是由一系列管路实现的，管路连接到增压空气源遍及整个座舱。空气被引导到飞机飞机顶板的通风口并从那里释放出来.

The topic sentence is the first and most important sentence in a paragraph.

You must use ear protection when you are near an engine that is in operation.

Make sure that the bogie rollers are aligned with the notches in the track.

To prevent damage to the engine, immediately install protective covers on all openings.

A mixture of water and methanol increases the power of the engine.

Make sure that the label fully attaches to the surface and that there are no bubbles.

Apply two layers of protective compound to prevent hydraulic fluid damage to the sealant.

It is the responsibility of the airplane owner and the pilot to insure that the airplane is loaded properly.

Overhaul of any or all components in this chapter must be accomplished with data supplied by the component manufacturer.

This paragraph should also explain that, in addition to the established inspections, other inspections may be required by Airworthiness Directives.