a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
the 15th letter of the Roman alphabet
the blood group whose red cells carry neither the A nor B antigens;
"people with type O blood are universal donors"
O的用法和样例:
例句
用作感叹词 (int.)
He didn't know that was Bical O's conspiracy. 完全不知到这是邪恶二齿猪的阴谋啊!
More flowers will come to you with perfume and pride,O world! 啊,世界,更多的花涌到你的怀里,带着芬芳,带着骄傲!