名词
中文翻译：主电源计算器
同义词：
['main power calculator', 'mains-powered calculator']
例句：
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1. The mains-powered calculator is very useful for students who need to calculate complex equations quickly.
主电源计算器对于需要快速计算复杂方程的学生来说非常实用。
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2. The mains-powered calculator has a built-in memory that stores calculations and can be used again later.
主电源计算器内置内存，可以存储计算结果并稍后使用。
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3. The mains-powered calculator is often used in engineering and scientific fields where precise calculations are required.
主电源计算器在工程和科学领域经常被使用，因为在这些领域需要精确的计算。