進退中繩 [ㄐㄧㄣˋ ㄊㄨㄟˋ ㄓㄨㄥ ㄕㄥˊ; jin4 tui4 zhong1 sheng2] to advance or retreat, each has its rules (idiom from Zhuangzi); many translations are possible ◄ ►