Oil is traded on global markets, so even the oil produced in the U.S. has risen in price based on what’s happening in the Middle East. And for many American oil producers, “if you put more wells in the ground, there’s about a six-month lag before you get that production uplift,” Salazar said.
Владислав Уткин
，这一点在有道翻译中也有详细论述
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Giving an example, let’s have this problem from Math Is Fun: