名词
中文翻译：许可线
同义词：
['permissible line', 'permissive line']
例句：
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1.The company's policy is to permit only those lines that are clearly marked.
该公司的政策是只允许那些明显标有界限的线路。
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2. The line between legal and illegal activities is often blurred in this area.
在这个地区，合法与非法活动之间的界限往往模糊不清。
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3. The government has decided to allow the construction of a new line through the city center.
政府决定允许通过市中心建设一条新线路。