英语翻译
不太准确哦。
说的是国家石油安全。
语言环境：
The simple answer is that the vulnerability premium is lower than the cost of becoming self-sufficient,but that response merely begs the question.Why is the vulnerability premium lower?It is lower for three primary reasons:(1) embargoes are not certain events-they may never occur; (2) domestic steps can be taken to reduce vulnerability of the remaining imports; and (3) accelerating domestic production would incur a user cost by lowering the amounts available to future users.