cluster marriage的用法和樣例：
例句
- At the time Morgan wrote his book, our knowledge of group marriage was still very limited.
當摩爾根寫他的著作的時候，我們關於群婚的知識還是非常有限的。 - This hetaerism derives quite directly from group marriage, from the ceremonial surrender by which women purchased the right of chastity.
這種雜婚制直接起源於群婚制，起源於婦女為贖買貞操權利而作的獻身犧牲。
