What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing..

　　①That the seas are being overfished has been known for years.

　　①That the seas are being overfished has been known for years.

　　②What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing.

　　③They have looked at half a century of data from fisheries around the world.

　　④Their methods do 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.

　　⑤According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) in a new fishery is reduced on average by 80% within 15 years of the start of exploitation.

　　⑥In some long-fished areas, it has halved again since then.

　　参考译文

　　①(现象：总)人们很多年前就已经知晓海洋被过度捕捞这个事实。

　　②(具体：分)诸如兰森姆·迈尔斯和鲍里斯·沃尔姆这样的研究者所说明的也仅仅是情形变化有多快。

　　③(例：分1)他们研究了全世界半个世纪里渔场的数据。

　　④(并列：分2)他们的方法不是试图确切估计在特定海域中鱼类的生物量(活生物物种的数量)，而是随着时间推移这些生物量的变化。

　　⑤(并列：分3)根据他们在《自然》杂志上发表的最 新论文，一个新的渔场在被开发后的 15 年中大型捕食动物的生物量平均减少了 80%。

　　⑥(并列：分4)在一些长期捕鱼的地区，那基数之上又减少了一半。