世交

这落英谷和佩琼山庄乃是 世交

(小师妹可是有婚约的人) ── Previous context

“Their families are old friends.”

我们家呢 和茅老家是 世交

(这个 是他年轻时的作品了) ── Previous context

“My family has been friends with Mr. Mao's for generations,”

齐家和黄家是 世交

(其实) ── Previous context

“The Qi and Huang families are old acquaintances.”

是与我家门当户对的 世交

(与我定亲的人家) ── Previous context

“is a long-standing match for ours.”