Natural ventilation that made use of piston wind induced by metro operation at the topopening of metro tunnel is a possible means of ventilation technology.
在地铁区间隧道顶部开孔，利用地铁列车运行产生的“活塞风”进行自然通风换气是一种可能的通风技术手段。
2
He soon hit top speed to outgun all his rivals in the opening qualifying session.
他在首场资格赛中很快就跑出了最快速度，击败了所有对手。
《柯林斯英汉双解大词典》
3
Fairy lights dance around the trapezoid opening at the top of the Shanghai World Financial Center (SWFC).