Word: 乃 (nǎi) 乃 dictionary entry nǎi to be; thus; so; therefore; then; only; thereupon Full dictionary entry for 乃 Example sentences using 乃 2 sentences, showing page 1 of 1. 此地乃古代的交通要道。 Cǐdì nǎi gǔdài de jiāotōng yào dào. This place was a major thoroughfare in ancient times. 长城乃中国著名的古迹。 Chángchéng nǎi Zhōngguó zhùmíng de gǔjì. The Great Wall is a famous historic site in China.