源 (yuán): source; origin

The source of the Yangtze River is on the Qinghai-Tibet Plateau, where melting ice and snow form tiny trickles.

We must solve this problem at its root, not just deal with surface symptoms.

Historians are working hard to find the origin of this war.

The teacher told us that water is the source of life, and we must save water.

The source of this story is an ancient folk legend.