名词
中文翻译：Unknown
同义词：
['SI unit', 'System Incorporated Unit']
例句：
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1.The measurement of distance is often based on the SI unit of length.
距离的测量通常基于长度的SI单位。
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2. The SI unit of mass is kilograms.
质量的SI单位是千克。
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3. The SI unit of temperature is Celsius.
温度的SI单位是摄氏度。