英语词汇“21-centimeter line”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	21-centimeter line
释义	21-centimeter line 21-centimeter line [¦twen·tē¦wən ′sen·tə‚mēd·ər ‚līn] (spectroscopy) A radio-frequency spectral line of neutral atomic hydrogen at a wavelength of approximately 21 centimeters and a frequency of approximately 1420 megahertz, that results from hyperfine transitions between states in which the spins of the electron and proton are parallel and antiparallel.
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。