Gǔ / dài / bù / luò / cháng / tōng / guò / shà / xuè / wéi / méng / lái / biǎo / shì / gòng / tóng / jìn / tuì

古代部落常通过歃血为盟来表示共同进退。

In ancient times, tribes often swore a sacred oath to show that they would stand together.