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.
Please （） the window to let some fresh air in. 【open】 请打开窗户通通气。
The process to remove exhaust gases by blowing in fresh air is called （）.
Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
（） is the removal of exhaust gases by blowing in fresh air.
In a vacuum boiling evaporator, the fresh water generated is pumped out by （）.
The fresh air intake of the inert gas system（）.
Prior to getting underway in fresh or brackish water，the Master must（）.
Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.
In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.
Ventilation, as you know, is a system or means of providing fresh air. It plays a very important part in the field of engineering.（根据上下文，划线单词的中文意思是什么？）
____ from the 18th floor when he saw the police coming near.
____ from the 18 th floor when he saw the police coming near.
People _____ in the countryside can enjoy more fresh air.
Which country did refugees come from in the 16th century?
Theseus was rescued by Heracles who had come down to the underworld for his 12th task.
There______be an open window somewhere, I can feel cold air coming in.
27. Why did the driver call the author and his brother "a breath of fresh air"?
One of the most important lakes in the United States is______, which is the largest fresh water lake in the world.
lf headaches only occur at night, lack of fresh air is often the cause
The excerpts taken from the novel describe the narrator's fresh experience in _________.
听力原文：M: It's like an oven here. You must be roasting. Can I open a window and get some fresh air in？
If a train this tunnel,it would draw in fresh air behind it.
Anvalve which allows the fresh charge of fuel／air into the combustion chamber。
