A boat sailing against the current must forge ahead or it will be driven back.
逆水行舟，不进则退 A boat that sails against the current will be pushed backward if it does not move forward.
犹如逆水行舟，不进则退 like a boat sailing against the current; we must forge ahead or be swept downstream
逆水行舟不进则退 Fall behind or drop
学如逆水行舟，不进则退。-中国谚语。
Learning is like rowing upstream, not to advance is to drop back. -chinese Proverb.
youdao
逆水行舟，不进则退。
Never fish in trouble water.
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