名词
中文翻译：黎曼积分
同义词：
['Riemann sum', 'Riemann sum approximation', 'Riemann sum approximation method']
例句：
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1. Inphysics, the Riemann integral is used to calculate the area under a curve.
在物理学中，黎曼积分用于计算曲线下的面积。
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2. The Riemann integral is a key tool in solving differential equations.
黎曼积分是解决微分方程的关键工具。
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3. The Riemann integral is also used in probability theory to estimate the expected value of a random variable.
黎曼积分也在概率论中被用来估计随机变量的期望值。