兵來將敵,水來土堰 [ㄅㄧㄥ ㄌㄞˊ ㄐㄧㄤˋ ㄉㄧˊ , ㄕㄨㄟˇ ㄌㄞˊ ㄊㄨˇ ㄧㄢˋ; bing1 lai2 jiang4 di2 , shui3 lai2 tu3 yan4]
counter soldiers with arms, water with an earth weir (idiom); different situations call for different action
to adopt measures appropriate to the actual situation
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