逆水行舟,不進則退 [ㄋㄧˋ ㄕㄨㄟˇ ㄒㄧㄥˊ ㄓㄡ , ㄅㄨˋ ㄐㄧㄣˋ ㄗㄜˊ ㄊㄨㄟˋ; ni4 shui3 xing2 zhou1 , bu4 jin4 ze2 tui4] like rowing a boat upstream, if you stop moving forward you fall back (idiom) ◄ ►