日蚀的产生是当太阳和月亮在天空中看起来几乎一样大时才可能。

Solar eclipses are possible only because the sun and the moon appear to be about the same size in the sky.

youdao

日蚀的产生是当太阳和月亮在天空中看起来几乎一样大时才可能。

Solar eclipses are possible only because the sun and the moon appear to be about the same size in the sky.

youdao