不自然
bùzìrán
ㄅㄨˋ ㄗˋ ㄖㄢˊ
- 1unnatural; artificial
Example
你很容易把母語說得通順流暢,卻很容易把非母語說得不自然。
nǐ hěn róngyì bǎ mǔyǔ shuō de tōngshùn liúchàng què hěn róngyì bǎ fēi mǔyǔ shuō de búzìrán
It's very easy to sound natural in your own native language, and very easy to sound unnatural in your non-native language.