- 释义：
- num. 三十，三十个
- 例句：
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There are thirty people in the classroom, counting the teacher.
把老师算上,教室里有30个人.
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It is about thirty miles between Nottingham and Sheffield.
从诺丁汉到谢菲尔德大约30英里.
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The drug put Simpson in a lull for thirty minutes.
药物使辛普森安静了30分钟.
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