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.
这意味着更多的海洋生物正在被捕捞，所以现在和过去之间的真正差异可能比捕捞量变化所记录的更糟糕。
Bobcats would normally cross the border to find mates or catch dinner-this one caught a rat.
山猫一般要跨越边境去寻找配偶或捕捉食物——这一只山猫捉住的是一只老鼠。
To try and maintain their catch, more fishermen use nets with a finer mesh. As more smaller, younger fish get caught, there are even fewer fish than before.
要维持过去的打渔量，更多的渔夫使用细孔网，打捞上更多的小鱼，可是由于小鱼都被捞了，鱼的总量比过去更少了。
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