两条小溪在村口汇合成一条大河。

Two small streams become ___confluent at the village entrance, forming a big river.

这条小溪是密西西比河的一条支流。

This small stream is a ___tributary of the Mississippi River.

两种神经在脑干处交汇融合。

The two nerves are ___confluent at the brainstem.