在半个世纪的辉煌中，NASA曾出现一些难堪的失误，从装反了的仪器，到英制单位惹的祸，后者直接导致了火星气候轨道器的失踪。
While writing a glorious chapter, NASA also left its most embarrassing goofs, from equipment installed backwards to errors with the metric system, which led to the missing of the Mars Climate Orbiter.
他们研究了半个世纪以来世界上所有的渔场，其研究方法并不是为了试图估算特定区域的海洋中实际生物总数（活着生物的总数），而是研究单位面积中海洋生物数量发生的变化。
Their methods de not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time.
他们研究了半个世纪以来世界上所有的渔场，其研究方法并不是为了试图估算特定区域的海洋中实际生物总数（活着生物的总数），而是研究单位面积中海洋生物数量发生的变化。
Their methods de not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time.
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