difficult problem

短语词组

短语

• a difficult technical problem 一个难题
• difficult point problem 难点问题
• difficult technical problem 技术攻关
• difficult theoretical problem 理论难题
• solve the difficult maths problem 解决困难的数学题
• solve a difficult technical problem 攻克技术难关
• so the difficult technical problem 悬而未决的问题
• Joseph Needham 's difficult cultural problem 李约瑟文化难题
• big and difficult problem 老大难;老大难”
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