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1·They paid a king's ransom for the painting.

他们花了一大笔钱购得那幅画。

2·That painting must be worth a king's ransom.

那幅画一定价值连城。

3·They do nothing but work and earn a king's ransom.

他们一门心思努力工作，然后获得报酬无数。

4·An emerald of that size, unflawed, would be worth a king's ransom.

一块那么大、而又无瑕疵的绿宝石会是价值连城的。