介词短语
中文翻译：少于
同义词：
['below', 'under', 'less than', 'fewer than', 'fewer than']
例句：
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1. The number of students in the class is less than 30.
班上的学生人数不到30。
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2. The temperature is below zero degrees Celsius.
温度低于零摄氏度。
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3.There are fewer cars on the road than buses.
路上的汽车比公交车少。