duty to defend the country (idiom) 守土有责; 守土有责 impossible to defend effectively 防不胜防; 防不胜防 to defend (a point of view etc) 辩解; 辩解 ..
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...impossible to defend effectively;cannot reckon with all eventualities;be not easy to guard against;cannot stand up to] 要防的事太多,提防不过来 [dampproof;moistureproof] 防止潮湿 .
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