ra

同义
atomic number 88 ra radium
词性
n
解释
an intensely radioactive metallic element that occurs in minute amounts in uranium ores
示例
None

同义
ra re
词性
n
解释
ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods
示例
None

同义
celestial longitude right ascension ra
词性
n
解释
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere
示例
one hour of right ascension equals fifteen degrees