2 sentences

1. 碳原子在有机分子中通常呈四价。

   tàn yuán​zǐ zài yǒu​jī fēn​zǐ zhōng tōng​cháng chéng sì​jià.

   Carbon atoms are usually tetravalent in organic molecules.

   Source: Dong Chinese Dictionary

2. 丙基是含有三个碳原子的有机官能团。

   bǐng jī shì hán​yǒu sān gè tàn yuán​zǐ de yǒu​jī guān​néng tuán.

   Propyl is an organic functional group containing three carbon atoms.

   Source: Dong Chinese Dictionary