弄懂弄通

nòngdǒngnòngtōng
to get a thorough understanding of sth (idiom)

CEDICT

Entry Composition

1 弄懂 nòngdǒng
  1. to make sense of
  2. to grasp the meaning of
  3. to figure out
2 弄通 nòngtōng to get a good grasp of