Zerolite
(低温膨胀的)聚苯乙烯管状绝缘体
🗣️ 情景例句
about your family background.
关于你的家庭背景的。
Mr. Green, Mr. Smith is here.
格林先生，史密斯先生在这里。
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。