Intermarriages were not uncommon.是什么意思？

Intermarriages were not uncommon.

通婚并不少见。

Intermarriages

n. 异族结婚( intermarriage的名词复数 )，近亲结婚；

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

uncommon

adj. 不寻常的，罕见的，非凡的，杰出的，非常接近的；

例句
Both are blessed with uncommon ability to fix things.
两人在修理东西上都有一手绝活。