名词
中文翻译：数量的天花板
同义词：
['maximum', 'limit', 'upper bound']
例句：
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1.The ceiling of the room is high enough for a single person to stand comfortably.
房间的天花板足够高，一个人站得舒服。
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2.The company's revenue has reached its ceiling, and it will not increase further.
公司的营收已经达到上限，不会再增加。
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3.The project's budget ceiling was exceeded by the final cost.
项目的预算上限被最终成本超过了。