1 sentence for 於 (yú — by)

1. 许多原来的花窗玻璃不幸毁于第二次世界大战期间。

   xǔ​duō yuán​lái de huā​chuāng bō​li bù​xìng huǐ yú dì'èr​cì​shì​jiè​dà​zhàn qī​jiān.

   Many of the original stained-glass windows were unfortunately destroyed during World War II.

   Source: CCMatrix