风幕机的原理首要是以电机股动风轮滚动，构成一道微弱无形的风门来间隔室内的冷暖气，防止冷暖气的丢失。
The principle of primary air curtain machine is to move the wind wheel rolling stock motor, a door to the weak invisible space room heating and cooling, heating and cooling to prevent loss.
原理表达是原理方案设计的首要问题，不仅要求能够抽象出物理原理，而且还需支持定常和非定常的设计任务。
The primary issue in principle schemes design is principle representation, which is required not only to abstract the physical principles, but also to support the design.
为了解决这个问题，必须十分熟悉有关dna分子合成的基本原理以及合成技术，这也是本文需要研讨的首要问题。
In order to solve this problem, we must focus our mind on the basic principle and techniques of DNA molecule synthesis firstly.
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