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First and last aid, Chinese idiom, Pinyin is sh ǒ UW ě IXI ā ngyu á n, which means to refer to each other. It's from Wen Xin Diao Long Fu Hui.
The origin of Idioms
In the Southern Dynasty, Liang and Liu Xie's Fu Hui of Wen Xin Diao Long: "if we help each other from the beginning to the end, then the Fu Hui can't be strengthened."
Idiom usage
Used as a predicate or attributive; used in affairs or war, etc.
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the corpses lie all over the countryside - shī héng biàn yě