プログレッシブ和英中辞典(第4版)の解説
こんかん【根幹】
&fRoman1;〔根と幹〕the root and the trunk
&fRoman2;〔物事の大本〕a basis ((複 -ses))；the root
彼らの政策の根幹を究明したかった
He wanted to study the basis [root] of their policy.／He wanted to 「find out what their policy was based on [get to the bottom of their policy].