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Meaning of 两国相争,不斩来使

Lookup via: Pinyin | Radicals
两 liǎng 国 guó 相 xiāng 争 zhēng , , 不 bù 斩 zhǎn 来 lái 使 shǐ (Trad.: 兩國相爭,不斬來使)
when two kingdoms are at war, they don't execute envoys (idiom)