The cause: Oxygen-rich blood is bright red, while blood with less oxygen turns dark and bluish-colored.
原因：富氧血是明红色，然而，含较少氧气的血变成黑色和蓝色调。
For example, eating dark chocolate squares can bring about benefits with regard to blood pressure (hypertension) over the long term.
比如，长期吃黑巧克力块有助于改善血压(高血压)。
But if a major volcanic eruption has polluted the stratosphere with thin haze, the eclipse will be dark red, ashen gray, or blood-black.
但如果发生大型火山喷发，导致同温层掺杂有薄云，那么月食就会变成暗红色、灰暗色或者血黑色。
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