2N-COUNT [usually plural](學科或活動的)界限,邊界 The boundaries of something such as a subject or activity are the limits that people think that it has. (學科或活動的)界限,邊界
The boundaries between history and storytelling are always being blurred and muddled. [+ between]
歷史和轶聞的分界向來是模糊而混亂的。
...extending the boundaries of press freedom. [+ of]