Pinyin
English Definition
Phrase
méi yǒu rén céng jiě jué guò zhè gè wèn tí 。
Nobody has ever solved this problem．
tā céng mèng xiǎng dào yáo yuǎn de nán hǎi zhū dǎo qù lǚ yóu 。
He dreamed of traveling to remote South Sea Islands.