知根知底兒
tri căn tri để nhi
Hán Việt: tri căn tri để nhi
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Eng
- Cihui 知根知底兒 hīgēnzhīdǐr f.e. 1. know the inside story of sb.'s secret 2. know sb. thoroughly | Wǒmen yīqǐ zhǎngdà, bǐcǐ ∼. We grew up together and we know each other well. 3. know the background