The interjection 噢
An interjection (感叹词) is a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction. It expresses feelings and emotions but does not name them. It is usually placed at the beginning of a sentence.
The interjection 噢 
expresses realization or surprise. It can be translated as “Oh!”.
expresses realization or surprise. It can be translated as “Oh!”.Examples
噢，他也去了！
Oh, and he was there too!
ō, tā yě qù le
噢，原来他是个当医生的！
Oh, so he is a doctor!
ō, yuánlái tā shì ge dāng yīshēng de
噢，我明白了
Oh, I got it
ō, wǒ míngbai le
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