形容词
中文翻译：自由地
同义词：
['free', 'unrestricted', 'at ease']
例句：
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1. The students are at liberty to choose their own courses.
学生们可以自由选择自己的课程。
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2. He felt at liberty to speak his mind without fear of repercussions.
他感到可以毫无顾忌地说出自己的想法，不必担心后果。
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3. She is at liberty to visit the museum whenever she wishes.
她可以随时去博物馆参观。