4 sentences for 於 (yú — by)

1. 这场比赛我们负于对手。

   zhè chǎng bǐ​sài wǒ​men fù yú duì​shǒu.

   We lost the match to our opponent.

   Source: Dong Chinese Dictionary

2. 受制于人。

   shòu​zhì yú rén.

   To be controlled by others.

   Source: Dong Chinese Dictionary

3. 古代中国认为皇帝是受命于天的天子。

   gǔ​dài Zhōng​guó rèn​wéi huáng​dì shì shòu​mìng yú tiān de tiān​zǐ.

   Ancient China believed the emperor was the Son of Heaven, ruling by divine right.

   Source: Dong Chinese Dictionary

4. 我们不能坐以待毙，听命于命运的安排。

   wǒ​men bù néng zuò​yǐ​dài​bì, tīng​mìng yú mìng​yùn de ān​pái.

   We cannot sit idly by and be at the mercy of fate.

   Source: Dong Chinese Dictionary