1、Married women could not view the Olympic Games in ancient Greece under penalty of death.
在古希臘如果已婚婦女去看奧林匹克運動會，就會被處以極刑。

2、Employees are forbidden to smoke on these premises, under penalty of instant dismissal.
嚴禁雇員在這些建筑物內吸煙，違則立即開除。

3、Non - payment is forbidden under penalty of forfeiture.
嚴禁不支付，違者處以沒收（財產等）的處罰。

4、He ordered enterprises to fulfil contracts under penalty of strict fines.
他以嚴厲罰款相威脅，命令企業(yè)履行合同。

5、Non-payment is forbidden under penalty of forfeiture.
嚴禁不支付，違者處以沒收之處罰。

under penalty of翻譯