采用多次曝光技术，提高了相减象的质量。
The quality of the subtraction image is improved by the multi exposure.
比如，假设要对两个时间对象进行相减来求二者之间的持续时间。
For example, imagine subtracting two Times to find the duration between them.
比如，假设要对两个时间对象进行相减来求二者之间的持续时间。
For example, imagine subtracting two Times to find the duration between them.
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