井干方知泉水贵。
When the Well 's dry , we know the Worth of Water .
三年来，我写了四篇关于珍惜爱护水资源的文章，如《井枯方知水珍贵》。
For the past three years , I was invited to write four articles of water resources , works such as We Never Know The Worth of Water Till the Well Is Dry .
井方