用进口弥补储量的下降 — — 大约一半的天然气储量和五分之一石油储量已经被用掉了 — — 意味着每年要花去3000亿美元以上的成本。
Covering this drop in reserves – more than half of gas reserves and a fifth of oil reserves have been consumed – with imports implies an annual cost of more than $300 billion.