(Book of Poetry, "Ground-Thumping Song") Since ancient times people have dug wells for drinking water and irrigation, but only in modern times have we come to a full understanding of groundwater with its broad extent and enormous volume.
人類自古以來就已鑿井汲取地下水飲用、灌溉，但直到近百年來，人們才對分布廣泛、水量龐大的地下水有了深入認識。