straight flight stair = straight run stair
straight flight stair = straight run stair
[消防英汉词典]
straight flight stair = straight run stair直跑楼梯
是什么意思，straight flight stair = straight run stair的解释，straight flight stair = straight run stair的翻译
straight flight stair = straight run stair
[消防英汉词典]
straight flight stair = straight run stair是什么意思，straight flight stair = straight run stair的解释，straight flight stair = straight run stair的翻译