2 sentences

1. 我们恰巧上了同一辆公交车。

   wǒ​men qià​qiǎo shàng le tóng yī liàng gōng​jiāo​chē.

   We happened to get on the same bus.

   Source: Tatoeba

2. 我今天去书店买书，恰巧碰到了多年未见的老同学。

   wǒ jīn​tiān qù shū​diàn mǎi shū, qià​qiǎo pèng​dào le duō nián wèi jiàn de lǎo tóng​xué.

   I went to the bookstore today and happened to run into an old classmate I hadn't seen in years.

   Source: Dong Chinese Dictionary