何以见得

何以見得
héyǐjiàndé
how can one be sure?

CEDICT

  1. (rhetoric) How can you know that...?; Why do you think that...?
  2. How can you know that...?; Why do you think that...?

Wiktionary

凭什麽知道。

重編國語辭典

Entry Composition

1 何以 héyǐ
  1. (literary) why
  2. how
2 见得 jiàndé
  1. to seem
  2. to appear
  3. (in a negative or interrogative sentence) to be sure