Esperanto is used internationally across language boundaries by at least 1 million people, particularly in specialized fields.
出自-2010年6月聽力原文
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
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（土地的）分界線，邊界
The boundary of an area of land is an imaginary line that separates it from other areas.
例句
...the Bow Brook which forms the western boundary of the wood...構(gòu)成了這片樹林西部邊界的鮑溪Drug traffickers operate across national boundaries.販毒分子進(jìn)行跨國(guó)販毒活動(dòng)。
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（學(xué)科或活動(dòng)的）界限，邊界
The boundaries of something such as a subject or activity are the limits that people think that it has.
例句
The boundaries between history and storytelling are always being blurred and muddled.歷史和軼聞的分界向來(lái)是模糊而混亂的。...extending the boundaries of press freedom.擴(kuò)大新聞自由的界限