プログレッシブ和英中辞典(第３版)の解説
ろんきょ【論拠】
the grounds for an argument
- 彼の主張には論拠がない［確かな論拠がある］
His argument is groundless [well grounded].／He has no [good] grounds for saying so. - 論拠を示せ
What is the basis for saying so?