极深研几 jí shēn yán jǐ

DEFINITIONS

  1. deep and detailed investigation (idiom)

CHARACTERS

极 jí
HSK 3
extreme, utmost, furthest, final
深 shēn
HSK 4
deep; depth; far; very, extreme
研 yán
HSK 4
grind, rub; study, research
几 jǐ
HSK 1
small table