arena

Compared meaning: a place for sports or shows (noun).

比较义项：举行体育或娱乐活动的场地（名词）。

• arena 本词

  Broader in scope: can be an indoor, enclosed space (often round or oval) for sports, concerts, or other events, without necessarily implying rows of seats.

  词义范围更广：可以指室内的、封闭的场地（常为圆形或椭圆形），用于体育比赛、演唱会或其他活动，不一定强调有阶梯座位。

  The band played to a sold-out arena packed with screaming fans.

  乐队在座无虚席的场馆里演出，全场歌迷尖叫不已。

• stadium

  Specifically a large outdoor (or open-roofed) structure with tiered rows of seats, built mainly for sports events like football or athletics.

  特指一种大型的（通常露天或有开合顶棚的）建筑，设有阶梯状座位，主要用于足球、田径等体育赛事。

  They built a new stadium with seating for eighty thousand spectators.

  他们新建了一座可容纳八万名观众的体育场。

Both mean a place where people watch sports or events. Arena is broader: it can be an indoor, enclosed space, round or oval, without necessarily having rows of seats. Stadium means a large, open structure with tiered rows of seats, built for sports like football.

两个词都指观众观看比赛的场地，但 stadium 特指带有阶梯看台、主要用于体育赛事的建筑物，而 arena 范围更广，也可以指室内的圆形场地或比赛区域本身，不一定强调看台座位。