例168　That means a higher proportion of what is in the sea is being caught, so the real difference between present and past is likely to be worse than the one recorded by changes in catch sizes.

【结构分析】so前面是个宾语从句That means...，宾语从句的主语是a higher proportion of what is in the sea，其中of后面是个what引导的从句，宾语从句的动词是is being caught, so后面是表示结果的句子，主语是the real difference，后面是介词短语between present and past，动词是个比较级短语，也就是is likely to be worse than，宾语是the one，后面是个分词定语，也就是recorded by changes in catch sizes。

【亮点回放】此句话的亮点在于so后面的比较级很复杂，里面有介词短语，还有分词定语，多种语法。

【核心词汇】

a higher proportion of　很大比例的

what is in the sea is being caught　海洋所捕捞的生物

the real difference between present and past　过去和现在的真正差别

worse than　糟糕于

changes in catch sizes　捕捞规模的变化

【参考译文】这意味着更高比例的海洋生物正在遭到捕获，因此今昔之间的真正差别可能比通过捕获量的变化记录的差别更大。