2 sentences for 赶上 (gǎn​shàng — encounter)

1. 西瓜正赶上喷儿，价格非常便宜。

   xī​guā zhèng gǎn​shàng pèn r, jià​gé fēi​cháng pián​yi.

   Watermelons are currently in their peak season, so the price is very cheap.

   Source: Dong Chinese Dictionary

2. 真不巧，正好赶上了早高峰的大堵车。

   zhēn bù qiǎo, zhèng​hǎo gǎn​shàng le zǎo gāo​fēng de dà​dǔ​chē.

   Unfortunately, I got caught in the morning rush hour traffic jam.

   Source: Dong Chinese Dictionary