2 sentences

1. 这种疾病是由特定的遗传因子引起的。

   zhè zhǒng jí​bìng shì yóu tè​dìng de yí​chuán yīn​zǐ yǐn​qǐ de.

   This disease is caused by specific genetic factors.

   Source: Dong Chinese Dictionary

2. 我们要学会如何对这个复杂的多项式进行因子分解。

   wǒ​men yào xué​huì rú​hé duì zhè gè fù​zá de duō​xiàng​shì jìn​xíng yīn​zǐ fēn​jiě.

   We need to learn how to factorize this complex polynomial.

   Source: Dong Chinese Dictionary