名词
中文翻译：Unknown
同义词：
['range', 'boundary', 'limit']
例句：
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1. The range of the sun is approximately 93 million miles.
太阳的运行范围大约是9300万英里。
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2. The boundaries between different cultures are often blurred.
不同文化之间的界限往往模糊不清。
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3. The limits of human knowledge are constantly expanding.
人类知识的极限在不断扩展。