床的两侧由金属立柱支撑。

The bed's sides are supported by metal ___uprights.

橄榄球比赛中，球击中右侧门柱但未能得分。

During the rugby match, the ball hit the right ___upright but failed to score.

她的小公寓里放着一架立式钢琴。

There is an ___upright piano in her small apartment.