As far back as we can go, we've seen an increase in the amount of food we've been able to harvest from our oceans. It just seemed like it was continuing to increase, until about 1980, when we started to see a decline.
回顾历史，我们发现 曾经我们可以从海洋中收获的食物总量 呈现过增长趋势。 直到 1980 年， 这样的增长趋势停滞了， 从此我们经历了下降的过程。