本底调查 Traditional 本底調查 běn dǐ diào chá 🔊 background investigation + Keep this word Meanings běn dǐ diào chá 本底調查 background investigation Its characters 本běn(measure word for books)HSK 1底dǐbottom; baseHSK 4调diàoto transferHSK 5查cháto researchHSK 3