目前全球对能源效率的重视，是过去数十年未见，甚至是前所未有的。
The emphasis around the world on energy efficiency has not been seen for decades - indeed, if ever before.
随着大雨和积雪融化引发的洪水达到几十年未见的历史高位，在美国几个州里，家住密西西比河沿岸的数以千计的居民已经撤离。
Thousands of residents in several states have evacuated their homes along the Mississippi River as flooding - triggered by rain and melting snow — has reached levels not seen in decades.
但是援朝人员还是发现国家研究机构对于儿童和老年人的营养改善在过去的十年里未见人任何提高。
But aid workers found last year that nutrition in state-run institutions for children and the elderly has not improved in the past decade.
因此到那个十年底，失业率已经下降到4.2%，通货膨胀平均在2.2%，是1960年底以来从未见到的数字。
By decade's end, the unemployment rate had dropped to 4.2 percent and inflation was averaging 2.2 percent — figures not seen since the 1960s.
我们从未见过她这么幸福过，她所展示出这样神采奕奕的一面我们已经有十年未曾见过了。
She's the happiest we've ever seen her, he really brings out a wonderful, carefree side to her that we haven't seen for years.
“失去的二十年”（而非“失去的十年”）之遗产，已使日本未来的世代背负上了沉重的债务，其相对规模之大，在经合组织中前所未见。
The legacy of not one but two lost decades has saddled Japan’s future generations with a debt whose relative size is unprecedented in the OECD.
这是个很高的要求，但考虑到全球气温可能会在几十年内创下自史前时代以来未见的高点，这个要求是恰当的。
This is a high bar, but appropriate given that global temperatures may within decades hit levels not seen since the prehistoric era.
中国北方部分地区，新疆，甘肃，青海和内蒙古地方已经遭遇沙尘暴，就像你从未见过至少在过去的十年。
In parts of Northern China, places in Xinjiang, Gansu, Qinghai and Inner Mongolia have been hit by sandstorms like you've never seen at least not in the past decade.
某产品在冲压加工过程中，壳体体部内外表面出现了氢鼓泡，这是几十年来壳体生产从未见到的。
Hydrogen blisters have been found on both inside and outside surfaces of shells of certain mild steel product during pressing. This phenomenon has not presented itself for decades of years.
中国北方部分地区，新疆，甘肃，青海和内蒙古地方已经遭遇沙尘暴，就像你从未见过至少在过去的十年。
In parts of Northern China, places in Xinjiang, Gansu, Qinghai and Inner Mongolia have been hit by sandstorms like you "ve never seen at least not in the past decade."
中国北方部分地区，新疆，甘肃，青海和内蒙古地方已经遭遇沙尘暴，就像你从未见过至少在过去的十年。
In parts of Northern China, places in Xinjiang, Gansu, Qinghai and Inner Mongolia have been hit by sandstorms like you "ve never seen at least not in the past decade."
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