“挑大梁”，原指在戏剧或艺术表演中担任主要角色（play a leading role [in a play, etc]）。现在泛指“承担重要的、起支柱作用的工作”，英文翻译为“play an important part，shoulder a heavy responsibility”。

例句：

小字辈挑大梁
The younger generation is shouldering heavy responsibilities.

据《娱乐周刊》杂志报道，英国男演员亨利•卡维尔将在扎克•施奈德掌镜的《超人：钢铁之躯》中挑大梁。
British actor Henry Cavill has been cast as the Man of Steel in director Zack Snyder's new Superman movie, the Entertainment Weekly reported.