| 单词 |
hale george ellery |
| 释义 |
Hale George Ellery
Hale, George Ellery 1868-1938. American astronomer who invented the spectroheliograph (1891) and was instrumental in the establishment of several observatories. He directed the Mount Wilson Observatory from 1904 to 1923.IdiomsSeehale |
| 随便看 |
- october 31, 2023
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- october 3, 2016
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- n,n-bis(2-hydroxyethyl) glycine
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- n-(n-butyl) thiophosphoric triamide
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