Someone told me you're the computer expert around here. Weel, I have a question for you...
有人告诉我你在这里是计算机专家,我有个疑难想请教你。。。
This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
因为如果有列火车开进隧道,它就把新鲜空气随之抽进了隧道。