我的妹妹将在我婚礼上担任伴娘。

My younger sister will be the ___bridesmaid at my wedding.

他在工作中总是扮演伴娘角色，帮助他人获得晋升，自己却从未得到升职机会。

He has always been the ___bridesmaid at work, helping others get promoted but never getting promoted himself.