英語翻譯
不太準(zhǔn)確哦。
說的是國家石油安全。
語言環(huán)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.