In ancient times the rich used jade or gold chopsticks to display their wealth.
在古代,富人家用玉或金子制成筷子以显示其家庭的富有。
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。