此乃 cǐ nǎi — this is; this is precisely 此乃 cǐ nǎi Characters: 此 · 乃 Definitions this is; this is precisely Examples 此乃本人多年心血所聚。 This is the fruit of many years of my labor. 此乃上策，不可错失良机。 This is the best course; we must not miss the chance.