| 单词 | helium group |
| 释义 | helium group (once / 5909656 pages) n WORD FAMILY helium group USAGE EXAMPLESIt should pass from the so-called helium group, to the hydrogen, or Class A group, not suddenly but by insensible gradations of spectrum. Anonymous, Popular Science Monthly—Oct, Nov, D...(2010) Wherever we find large irregular gaseous nebulae we find stars in the early subdivisions of the helium group. Anonymous, Popular Science Monthly—Oct, Nov, D...(2010) n the series of inert gases Hyper series similar things placed in order or happening one after another |
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