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高中《物理》第二册（必修）第１７２面第４题提到了日食、月食问题，我们在教学中有时也用日食、月食的例子来讲解光的直线传播．大家都知道日食中有日全食、日偏食、日环食，月食中只有月全食和月偏食，没有月环食，为什么没有月环食呢？要形成月环食，就一定是地球的阴影只?
The fourth issue of the 172th face of High School Physics (Volume 2) (Compulsory) refers to the solar eclipse and eclipse problems. We sometimes use the example of solar eclipse and eclipse to explain the linear propagation of light. Everyone knows that there are total solar eclipses, partial eclipses and daily eclipses in the solar eclipse. The eclipse only has total eclipses and partial eclipses. There is no eclipse of the eclipse. Why is there no eclipse of eclipse? To form a full moon, it must be the shadow of the earth.