难题

In sentences Pinyin

如何rú hé提高tí gāo工作gōng zuò效率xiào lǜ是shì我们wǒ men现在xiàn zài要yào面临miàn lín的de难题nán tí。The challenge we are going to face is how to increase work efficiency. #2442099

他tā擅长shàn cháng解答jiě dá数学shù xué难题nán tí。He is good at solving complicated mathematical problems. #3076567

他tā正在zhèng zài思考sī kǎo这个zhè ge难题nán tí。He's thinking about this difficult problem. #3702568