The interjection 咦
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 咦 
sound can be made either when expressing surprise, or when you feel puzzled or confused. It can be translated as “Huh?”, “What?”, “Gee”.
sound can be made either when expressing surprise, or when you feel puzzled or confused. It can be translated as “Huh?”, “What?”, “Gee”.Examples
咦，你是怎么知道的？
Huh? How did you know?
yí, nǐ shì zěnme zhīdào de
咦，你是不是觉得自己很聪明？
Gee, do you think you are the smartest?
yí, nǐ shìbushì juéde zìjǐ hěn cōngmíng
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