Tā / men / suī / rán / rèn / shi / bù / jiǔ / què / cháng / bǎ / zhè / duàn / yǒu / yì / bǐ / zuò / táo / yuán / jié / yì

他们虽然认识不久，却常把这段友谊比作桃园结义。

Although they had not known each other long, they often compared their friendship to an oath of brotherhood.