在几十年中，凯尔格伦设计了一个小斗犬武器的数量，采用的第一个底部，然后向前提取。
During following decades, Kellgren designed a number of bullpup weapons, featuring first bottom and then forward extraction.
秘鲁国家石油公司董事长丹尼尔·萨瓦说，在几十年中一无所获之后，勘探又开始取得成果了。
Daniel Saba, the chairman of Perupetro, says that exploration is yielding results again after decades in which little was found.
同样，70%的或更多的人称在几十年中经理人都被支付过多的薪水，只有少数人说低水平的职业的薪水很少。
Similarly, 70 percent or more have said for decades that executives are overpaid, and a smaller share have said that lower-level occupations are underpaid.
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