2 sentences

1. 这无疑是一个明智的决定。

   zhè wú​yí shì yī gè míng​zhì de jué​dìng.

   This is undoubtedly a wise decision.

   Source: Dong Chinese Dictionary

2. 他无疑是我一生中最重要的老师。

   tā wú​yí shì wǒ yī​shēng zhōng zuì zhòng​yào de lǎo​shī.

   He is, without question, the most important teacher of my life.

   Source: OpenSubtitles