Esperanto is used internationally across language boundaries by at least 1 million people, particularly in specialized fields.
世界语方便了世界上至少100万操着不同语言的人交流，特别是在专业领域。
Language boundary
原声例句
历年英语六级听力真题（含译文）
英语百科
Language border
（重定向自Language boundary）
A language border or language boundary is the line separating two language areas. The term is generally meant to imply a lack of mutual intelligibility between the two languages. If two adjacent languages or dialects are mutually intelligible, no firm border will develop, because the two languages can continually exchange linguistic inventions; this is known as a dialect continuum. A "language island" is a language area that is completely surrounded by a language border.
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