垂直 chuiˊ zhiˊ

(Perpendicular, Vertical)

Vertical, Perpendicular

坑道 kengˉ daoˋ

(Tunnel(s))

Tunnel(s)

垂

Droop, Drop down, Hang, Hang down, Suspend

Droop, Hang, Drop down, Suspend, Hang Down

直

Direct, Frank, Honest, Straight, True, Upright, Vertical

Straight, Frank, Direct, Vertical, Upright, Honest, True

坑

Pit

Pit

道

Direction, Method, Path, Principle, Skill, Spiritual, Way

Path, Direction, Way, Skill, Method, Principle, Spiritual path