名词
中文翻译：口头计算
同义词：
['oral estimation', 'oral estimate']
例句：
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1.The teacher asked us to do an oral calculation of the area of a square.
老师让我们做一次口头计算，算出一个正方形的面积。
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2. The engineer made an oral calculation before presenting his report.
工程师在提交报告之前做了一次口头计算。
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3. During the presentation, the student used an oral calculation to explain the problem.
在演示过程中，学生用口头计算来解释这个问题。