Sōu / suǒ / duì / zài / hé / biān / fā / xiàn / le / xīn / de / xiàn / suǒ / yú / shì / kuò / dà / le / sōu / suǒ / fàn / wéi

搜索队在河边发现了新的线索，于是扩大了搜索范围。

The search party found a new clue by the river and therefore expanded the search area.