arena
/ərˈinə/
a particular environment or walk of life
中文释义：舞台；领域；竞技场
The political arena is often filled with fierce debates and negotiations.
政治舞台常常充满激烈的辩论和谈判。
She quickly became a leading figure in the international business arena.
她迅速成为国际商业领域的领军人物。