Some are new compounds which have been used for only a few years.
其中一些化合物是近几年开始使用的。
Gas supplies in the Cook inlet-which used to mean cheap energy for alaskans-are running out.
从库克湾输出的天然气曾一度是阿拉斯加最廉价的能源，但现在库克湾的天然气也近于枯竭。
Gas supplies in the Cook inlet-which used to mean cheap energy for alaskans-are running out.
从库克湾输出的天然气曾一度是阿拉斯加最廉价的能源，但现在库克湾的天然气也近于枯竭。
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