| 单词 | ground level |
| 释义 | > as lemmasground level ground level n. Physics = ground state n.; (see also Compounds 1a above). ΘΚΠ the world > matter > physics > quantum theory > raising energy level, excitation > [noun] > state of lowest level ground level1923 ground state1926 1923 H. L. Brose tr. A. J. W. Sommerfeld Atomic Struct. & Spectral Lines vi. 325 In our diagram the absorption lines would have to be represented by arrows that start out from the natural or ground level and are directed upwards. 1953 L. H. Aller Astrophysics 25 The excitation potential in ev is the potential through which a bombarding electron must drop in order to acquire sufficient energy to excite an atom from the ground level to the level in question. < as lemmas |
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