在去年十二月份发布的的一份报告中，美国能源部估计电传动汽车和近海风力田的广泛使用，在2015年前可能导致这些金属元素的短缺。
In a report released last December, the U.S. Department of Energy estimated that widespread use of electric-drive vehicles and offshore wind farms could cause shortages of these metals by 2015.
在去年十二月份发布的的一份报告中，美国能源部估计电传动汽车和近海风力田的广泛使用，在2015年前可能导致这些金属元素的短缺。
In a report released last December, the U. S. Department of Energy estimated that widespread use of electric-drive vehicles and offshore wind farms could cause shortages of these metals by 2015.
随着兆瓦级风力发电机的开发，对其传动齿轮箱的设计可靠性要求越来越高。
With the megawatt class wind turbines being developed, the driving gearbox must have high reliability.
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