推荐回答（2个）
其实你好像打错了，OS 应该是OF，搞了半天，不知道OS是什么东西，操作系统？这样就乱了。呵呵。改了之后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 ccatch size.
的意思是：这意味着更高比例的海洋生物正在被捕杀，因此介于现在和过去这一段时间，海洋生物量的真正差别可能比捕获量所记录的变化更要糟糕。
is likely to be
很可能是 catch sizes捕鱼数量、区域 proportion
n.比，比率；[数学]比例（法）；面积；相称，平衡
vt.使成比例；使相称；使均衡
翻译：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。
希望能帮助到您。
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