O

名词 o:

1. 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
   同义词：oxygen, atomic number 8
2. the 15th letter of the Roman alphabet
   同义词：letter o
3. the blood group whose red cells carry neither the A nor B antigens
   同义词：type O, group O

1. Have you finished lunch already? It's only12 o' clock!
   你已经吃过午饭了吗？现在才12点。
2. Closing time at this pub is eleven o' clock.
   这酒馆的打烊时间是十一点。
3. Hello. I'd like to reserve a table for two for eight o' clock, please.
   你好，我要订一张今晚八点两个人的餐桌。

o 或 O

n.（名词）
【复数】 o`s 或 O`s
The 5th letter of the modern English alphabet.
O字母：英语字母表的第十五个字母
Any of the speech sounds represented by the lettero.
O的读音：字母O 所表示的读音
The 5th in a series.
序列中的第十五
Something shaped like the letter O.
O字形物：形状类似字母O的物体
A zero.
零
O A human blood type of the ABO system.
O O型血：ABO血型结构的一种人体血型

o
o 2
abbr.（略语）
O or O. Printing Octavo.
O 或 O. 【印刷术】 Octavo.
Ohm.
Ohm.