vertical

adj. /ˈvɜːrtɪkl/ C1

垂直的；立式的

Standing or pointing straight up at an angle of 90 degrees.

仙境例句

The well was vertical; Alice fell straight down, with its walls close beside her.

井是笔直向下的，爱丽丝直直地往下落，井壁就在身旁。