ブラウザの設定でJava Scriptの使用を有効にしてご利用ください。
a difficult [hard, knotty] problem
a poser
《口語》 a hard nut to crack
難問を提出する
put a hard question to somebody
set a poser for somebody
読み方:なんもん
正解を持つとされる特に難しい問題
(a particularly baffling problem that is said to have a correct solution)
難しい問題
(a difficult problem)
読み方 ナンモン
stumper
読み方 なんもん
A difficult question; a hard question; a puzzling question; a perplexing problem; a knotty problem; a hard nut to crack
難問
a thorny issue