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.
警察，消防队员和海洋救援队在爆炸后几分钟赶到了现场，但是却花了将近半个小时才将猛烈的火势控制住。
Police, firefighters and Marine rescue teams were rushed to the spot minutes after the blast but took almost half an hour to bring the rampant fire under control.
科学家们说在北太平洋，有一片面积相当于半个美国德克萨斯州，重达30亿吨的塑料垃圾正在威胁海洋生命。
In the northern Pacific Ocean, scientists say a large pool of plastic waste half the size of the U. S. state of Texas, weighing 300 million tons, is threatening Marine life.
科学家们说在北太平洋，有一片面积相当于半个美国德克萨斯州，重达30亿吨的塑料垃圾正在威胁海洋生命。
In the northern Pacific Ocean, scientists say a large pool of plastic waste half the size of the U. S. state of Texas, weighing 300 million tons, is threatening Marine life.
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