缩写
中文翻译：没有特定含义
同义词：
['N/A', 'None', 'Absent', 'Nonexistent']
例句：
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1. MSAC is a program that helps students learn about the environment.
MSAC是一个帮助学生学习关于环境的程序。
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2. The team was absent from the meeting due to illness.
由于生病，该团队缺席了会议。
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3. The absence of sunlight can lead to vitamin D deficiency.
阳光的缺乏可能导致维生素D缺乏。