yuán
shēn
liú
cháng, source: the source of a river; flow: process. The source is deep and the current is long. Metaphor has a long history. As a predicate and attributive; it refers to a long history.
yuán
guǎng
liú
cháng, source: source; flow: process. The source is far away and the current is long. It is a metaphor for having a long history as a predicate and attributive; it refers to a long history.