oxygen
/ˈɒksɪdʒən/noun
mass noun
- a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Oxygen forms about 20 per cent of the earth's atmosphere, and is the most abundant element in the earth's crust, mainly in the form of oxides, silicates, and carbonates. (Symbol: O)氧（符号：O）。
派生词
oxygenous
adjective词源
late 18th cent.: from French （principe） oxygène 'acidifying constituent' (because at first it was held to be the essential component in the formation of acids).