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西方有首流传甚广的民谣:丢失一个钉子,坏了一只蹄铁;坏了一只蹄铁,折了一匹战马;折了一匹战马,伤了一位骑士;伤了一位骑士,输了一场战斗;
In the West, there are the first folk songs that have been widely circulated: losing a nail and breaking a shoe; breaking a shoe and folding a horse; folding a horse and injuring a knight; wounding a knight , Lost a battle;