《墨子·52章 备城门》
墨子说： 我方城池修固，守城器具备好，柴禾粮草充足，上下相亲，又取得四邻诸侯的救助，这就是用来长久守御的条件。
子墨子曰： 我城池修，守器具，推粟足，上下相亲，又得四邻诸侯之救，此所以持也。
Mo Zi said: "If the city walls are sturdy, the defense equipment is in good condition, the firewood and food supplies are sufficient, the relations between the officials and the people are close and harmonious, and the neighboring states provide assistance, then these are the conditions for long-term defense." 
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 子墨子曰： 我城池修，守器具，推粟足，上下相亲，又得四邻诸侯之救，此所以持也。 [/INST] Mo Zi said: "If the city walls are sturdy, the defense equipment is in good condition, the firewood and food supplies are sufficient, the relations between the officials and the people are close and harmonious, and the neighboring states provide assistance, then these are the conditions for long-term defense." </s>
Identify the key themes in this Classical Chinese text and explain them in English: 子墨子曰： 我城池修，守器具，推粟足，上下相亲，又得四邻诸侯之救，此所以持也。
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Mo Zi said: "If the city walls are sturdy, the defense equipment is in good condition, the firewood and food supplies are sufficient, the relations between the officials and the people are close and harmonious, and the neighboring states provide assistance, then these are the conditions for long-term defense."
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