difficult problem

短语词组

短語

• a difficult technical problem 一個難題
• difficult point problem 難點問題
• difficult technical problem 技術攻關
• difficult theoretical problem 理論難題
• solve the difficult maths problem 解決睏難的數學題
• solve a difficult technical problem 攻尅技術難關
• so the difficult technical problem 懸而未決的問題
• Joseph Needham 's difficult cultural problem 李約瑟文化難題
• big and difficult problem 老大難;老大難”
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