polygamia

例句：

1. 1.The ancient Greeks practiced polygamia, where a man could have multiple wives.
   古希腊人实行多妻制，一个男人可以有多个妻子。
2. 2. In some cultures, polygamia is still common, although it is no longer the norm in most societies.
   在某些文化中，多妻制仍然很常见，尽管在大多数社会中已经不再是常态。
3. 3. Polygamia has been studied for its effects on social and economic structures.
   多妻制对社会经济结构的影响一直是研究的重点。