- - -
源头很远，水流很长。比喻历史悠久。
(1) [of long standing and well established as a stream runs a long course from a remote source]∶因源头远而流程长 (2) [long history]∶指传统或历史长久 言其所学之正,源远而流长也。——清·佚名《杜诗言志》
- -