⇒ 这孩子诚然懂礼貌。 (Zhè háizi chéngrán dǒng lǐmào.) This child really does know how to be polite.
(= 固然) admittedly
⇒ 困难诚然很多,但我们有信心克服。 (Kùnnan chéngrán hěn duō, dàn wǒmen yǒu xìnxīn kèfú.) Admittedly there are many difficulties, but we are confident of overcoming them.