S.R.

汉语翻译

英语解释：

名词 s.r.:

1. a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
   同义词：strontium, Sr, atomic number 38
2. the unit of solid angle adopted under the Systeme International d'Unites
   同义词：steradian, sr