老tan

Meaning

The pattern "流水的a，铁打的b" expresses that no matter how many different types of "a" appear, "b" remains unchanged. From the proverb "铁打的营盘流水的兵" (the barracks are iron, soldiers flow like water). Expresses soldiers' hardship and spirit of succession. Used in various fields. E.g., business: "铁打的算盘，流水的兵" (the abacus is fixed, people flow).