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1.Their methods do not attempt to estimate theactual biomass (the amount of living biologicalmatter) of fish species in particular parts of theocean, but rather changes in that biomass over time. 「译文」他们的方法并不是要评估特定海域鱼种的实际生物量，而是评估在这一段时间内生物量的变化。 「解析」这是一个简单句，但是宾语是两个，一是the actualbiomass(the amount of living biological matter) offish species in particular parts of the ocean，一是changes in that biomass over time.rather意为“宁愿;有点，相当”。I'd rather stay at home.(我宁愿呆在家里。)He's rather lazy.(他有些懒。)有时rather在句中表示转折，或者对前文进行纠正(经常与or连用)。There are five, rather six, personskilled in the traffic accident.(在这场车祸中，共有5人，应该是6人死亡。) 2.According to their latest paper published in Nature，the biomass of large predators (animalsthat kill and eat other animals) in a new fishery is reduced on average by 80% within 15 years ofthe start of exploitation. In some long fished areas, it has halved again since then. 「译文」根据他们在《自然》上发表的最新论文，在新渔场开始捕鱼的15年之内，大型捕食动物的生物量平均减少80%.在一些长期捕鱼的海域，生物量在此之后又减少了一半。 | 
