HSK 6
哇
wā拟声
Wow!; sound of a child's crying; sound of vomiting
哇，山顶的日出真漂亮！
Wā, shān dǐng de rì chū zhēn piào liang!
Wow, the sunrise from the summit is beautiful!
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Also free:
New in the HSK 3.0 word list at level 6.