He groped his way up the staircase in the dark.

他摸黑走上楼梯。

《牛津词典》

Around the dark core of an optical vortex, the energy flow carried by the light beam is like a spiral staircase, flowing in a clockwise or counterclockwise direction.

绕着光涡旋的黑暗中心，光束携带的能量流就像螺旋梯，沿着顺时针或者逆时针方向流动。

youdao

Originally, the house was entered via a dark, stuffy corridor located under a staircase.

最初，住宅通过楼梯下黑暗闷热的走廊进入。

youdao

The mansion's grand staircase had long since been removed, but the dark wood moldings, carved wood details and plasterwork survived in many of the rooms, as do gilded ornamental flowers and leaves.

WSJ: Pieces of a Mansion Puzzle on Block