| 单词 | helium group |
| 例句 | It should pass from the so-called helium group, to the hydrogen, or Class A group, not suddenly but by insensible gradations of spectrum. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 Wherever we find large irregular gaseous nebulae we find stars in the early subdivisions of the helium group. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 |
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