toughie
US /ˈtʌf.i/
UK /ˈtʌf.i/
名詞
1.
難題, 棘手的問題
a difficult problem or question
範例:
•
That math problem was a real toughie.
那個數學題真是個難題。
•
The last question on the exam was a toughie.
考試的最後一個問題是個難題。