You've already quoted a price of $ 800 per 1,000. Is there a discount for larger orders?
你报的价是每1000个要美金800元,如大量订购有折扣吗?
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。