Please （） the window to let some fresh air in. 【open】　　请打开窗户通通气。

In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）

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The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

Open the （）before starting an air compressor.

Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.

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（） is the removal of exhaust gases by blowing in fresh air.

The fresh air intake of the inert gas system（）.

（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.

The exhaust valve is opened at about the same time （） the air inlet ports are opened.

In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.