2N-COUNT [usually plural](学科或活动的)界限,边界 The boundaries of something such as a subject or activity are the limits that people think that it has. (学科或活动的)界限,边界
The boundaries between history and storytelling are always being blurred and muddled. [+ between]
历史和轶闻的分界向来是模糊而混乱的。
...extending the boundaries of press freedom. [+ of]