| 单词 | oxygen |
| 释义 | oxygen n. Chem. a colourless tasteless odourless gaseous element, occurring naturally in air, water, and most minerals and organic substances, and essential to plant and animal life. Usage Symb.: O. Phrases and idioms oxygen mask a mask placed over the nose and mouth to supply oxygen for breathing. oxygen tent a tentlike enclosure supplying a patient with air rich in oxygen. Derivatives oxygenous adj. Etymology: F oxyg{egrave}ne acidifying principle (as OXY- 2): it was at first held to be the essential principle in the formation of acids |
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