空调压缩机中所指定的一个齿间容积对的工作过程。阴螺杆、阳螺杆转向互相迎合一侧的气体受压缩，这一侧面称为高压区；相反，螺杆转向彼此背离的一侧面， 齿间容积在扩大并处在吸气阶段，称为低压区。这两个区域被阴螺杆、阳螺杆齿面间的接触线分隔开。可以近似地认为：两螺杆轴线所在平面是高、低压力区的分界 面。
The working process of a tooth volume pair specified in the air conditioning compressor. On the contrary, the screw turns to the side away from each other, and the volume between the teeth is expanding and in the suction stage, which is called the low pressure area. The two areas are separated by the contact lines between the tooth surfaces of the female screw and the male screw. It can be approximately considered that the plane of the axis of the two screws is the interface of the high and low pressure areas.
压缩制冷剂（例如氟利昂）变成液态。然后利用液态在常压下变气态时的吸热现象制冷。
Compress the refrigerant (e.g. Freon) into a liquid state. Then we use the phenomenon of heat absorption when the liquid changes into gas state at atmospheric pressure to cool.
空气密度是很小的。你拿根打针用的针管。抽满一针管空气，用手堵住出气口，推动针管就是在压缩空气了。用针管就可以把气体压缩三分之一的体积。
The air density is very small. You take a syringe for injection. Fill a syringe with air, block the air outlet with your hand, and push the syringe to compress the air. With a needle tube, one third of the volume of gas can be compressed.