月亮缺了一块，是平常月相还是月食？别只看缺口

When Earth is positioned precisely between the Moon and Sun, Earth’s shadow falls upon the surface of the Moon, dimming it and sometimes turning the lunar surface a striking red over the course of a few hours.

不承诺某次月食具体持续多久或当地可见范围。

The Sun’s light comes from one direction, and it always illuminates, or lights up, one half of the Moon – the side of the Moon that is facing the Sun. The other side of the Moon is dark.

只用无食情形的受光近似，不断言所有时刻含月食都严格一半受直射光。

On Earth, our view of the illuminated part of the Moon changes each night, depending on where the Moon is in its orbit, or path, around Earth.

不继承周边正文“太阳系仅一个光源”的过度概括；不把普通月相误写成月食。

The tilt of the Moon’s orbit prevents us from having monthly solar and lunar eclipses.

轨道平面的倾斜只能解释为何不是每次满月都月食，不能替代当次月食预报。

Lunar eclipses occur at the full Moon phase .

“满月”是相位条件，不能靠照片看起来圆就推出正在月食。

The shadow grows and then recedes without ever entirely covering the Moon.

这句描述月偏食，不用于半影月食。

When Earth is positioned precisely between the Moon and Sun, Earth’s shadow falls upon the surface of the Moon, dimming it and sometimes turning the lunar surface a striking red over the course of a few hours.

不承诺某次月食具体持续多久或当地可见范围。

The Moon travels through Earth’s penumbra, or the faint outer part of its shadow. The Moon dims so slightly that it can be difficult to notice.

不声称所有半影月食肉眼必定看不见。

Some of the sunlight passing through Earth’s atmosphere reaches the Moon’s surface, lighting it dimly. Colors with shorter wavelengths ― the blues and violets ― scatter more easily than colors with longer wavelengths, like red and orange. Because these longer wavelengths make it through Earth’s atmosphere, and the shorter wavelengths have scattered away, the Moon appears orangish or reddish during a lunar eclipse.

不把红色当月食的唯一或充分判据，不预报颜色深浅。