답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :
41. It’s 24℃ in the office and 32℃ outside. It takes a lot of electricity to cool the entire building. Air flows in and out of a building because of differences in air pressure. If outside air flows into the building, it takes more energy to cool down the inside air. Regular foot traffic in a large office building can result in a lot of air leaks. That presents a challenge for engineers: How do you allow people and things to move in and out of a building while minimizing unwanted air flow? The revolving door can be presented as a solution for this problem. A revolving door isn’t airtight, but it makes air pressure differences smaller. Every time the door spins, some air will leave the building and some will come in, but overall, much less passes.

2008년 9월 고2 평가원 문제입니다.

일반적으로 부정관사 a가 정관사 the를 선행하는데...
이 글에선 그렇지않더라구요..
왜 그런 걸까요?