toughie
US /ˈtʌf.i/
UK /ˈtʌf.i/
名词
1.
难题, 棘手的问题
a difficult problem or question
示例:
•
That math problem was a real toughie.
那个数学题真是个难题。
•
The last question on the exam was a toughie.
考试的最后一个问题是个难题。