数量级
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定义
用10的幂来表示和比较量的方法，每一个数量级代表与前一个的十倍差异。
解释
The difference between 1 mm and 1 km is 6 orders of magnitude (10⁶). The observable universe spans roughly 93 billion light-years, while a proton is about 10⁻¹⁵ m — a difference of 41 orders of magnitude. Orders of magnitude are indispensable when comparing quantities too different for ordinary arithmetic.
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