One thorn of experience is worth a whole wilderness of warning.
One thorn of experience is worth a whole wilderness of warning. 一次痛苦的经验抵得上无数次的警告。
Nov 15, 2019 Nov 15, 2019 https://d2t.bkseeker.com/one-thorn-of-experience-is-worth-a-whole-wilderness-of-warning