对于一张曝光均匀的图像来说，直方图中柱形应该呈现均匀的抛物线(钟型)分布。

For a nice evenly exposed image, the bars on your histogram should be an evenly distributed wide bell curve.

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3对于许多随机变量来说，一个好的选择是正态分布，常常表现为一个钟型曲线，如图1所示。

3 For many random variables, a good choice is the normal distribution, often represented as a bell-shaped curve, shown in Figure 1.

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采用气氧作氧化剂、气氢作燃料，对具有高度补偿特性的塞式喷管和双钟型喷管进行了点火热试。

By employing the gaseous oxygen as oxidizer and gaseous hydrogen as fuel, hot-firing tests were performed for aerospike nozzle and dual-bell nozzle test engines with altitude compensating features.

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I should be able to do nice bell-shaped curves, but it's harder than it looks standing up here; so that's your bell-shaped curve.

我还是挺擅长画钟型曲线的,但站着画真的不太容易,这就是钟型曲线

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