They were worth a mint.是什么意思？

They were worth a mint.

它们价值不菲。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

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。

worth

adj. 值得的，有…的价值，等值的，有…的财产；n. 财富，财产，价

例句
Is it worth fighting a big war, in the name of an abstraction like sovereignty?
在主权之类抽象概念的名义下打一场大战是否值得呢？

mint

n. 薄荷，铸币厂，大量，尤指钱，来源；vt. 铸造，铸币，发明或创造；adj. 崭新的，完美的，未损坏的；

例句
Garnish with mint sprigs.
用薄荷枝装点。