2 sentences

1. 在这个代数式中，x的系数是5。

   zài zhè​gè dài​shù shì zhōng,x de xì​shù shì5.

   In this algebraic expression, the coefficient of x is 5.

   Source: Dong Chinese Dictionary

2. 为了确保建筑质量，工程师提高了安全系数。

   wèi​le què​bǎo jiàn​zhù zhì​liàng, gōng​chéng​shī tí​gāo le ān​quán xì​shù.

   To ensure construction quality, the engineer increased the safety factor.

   Source: Dong Chinese Dictionary