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

1. Have you finished lunch already? It's only12 o' clock!
   你已經吃過午飯了嗎？現(xiàn)在才12點。
2. Closing time at this pub is eleven o' clock.
   這酒館的打烊時間是十一點。
3. Hello. I'd like to reserve a table for two for eight o' clock, please.
   你好，我要訂一張今晚八點兩個人的餐桌。

o 或 O

n.（名詞）
【復數】 o`s 或 O`s
The 5th letter of the modern English alphabet.
O字母：英語字母表的第十五個字母
Any of the speech sounds represented by the lettero.
O的讀音：字母O 所表示的讀音
The 5th in a series.
序列中的第十五
Something shaped like the letter O.
O字形物：形狀類似字母O的物體
A zero.
零
O A human blood type of the ABO system.
O O型血：ABO血型結構的一種人體血型

o
o 2
abbr.（略語）
O or O. Printing Octavo.
O 或 O. 【印刷術】 Octavo.
Ohm.
Ohm.