流派 (liú pài): tributary (stream); (fig.) school (of thought); genre; style

This river has many tributaries in the mountainous area, which eventually all merge into the main stream to form a large river.

Many tributaries of the Yangtze River rise in water level during the rainy season, posing a flood threat to residents along the banks.

In geography class, the teacher pointed out the main tributaries of this large river on a map and explained how they converge.