请教0G13-01

ciwei22

Proponents of theory A dispute the assumption that
a school of thousands of fish is highly visible.
Experiments have shown that any fish can be seen,
(10) even in very clear water, only within a sphere of
meters in diameter. When fish are in a compact group,
the spheres of visibility overlap. Thus the chance of a
predator finding the school is only slightly greater
than the chance of the predator finding a single fish
(15) swimming alone. Schooling is advantageous to the
individual fish because a predator's chance of finding
any particular fish swimming in the school is much
smaller than its chance of finding at least one of the
same group of fish if the fish were dispersed
(20) throughout an area.
这段理解起来很诡异嘛！当然，我用脚趾头想也知道，它是在支持A的调调，但是，它先说鱼群Highly可见，每一条都可见（PS：Even的没道理嘛！明明就是越清的水越可见嘛，越小的范围，目标越容易发现嘛），接着又说发现鱼群的机会比单个鱼稍稍的大一点。再来呢，鱼群之所以对单个鱼是有优势是因为比单个鱼在鱼群中被发现的机会小于自己在一个小群体中。。。。。。怎么觉得很缭乱嘛。。。虽然说了一点好处，可以完全拉不出来每一句跟每一句的逻辑嘛。。。。。求救，求救！

ciwei22

哦，应该是When fish are in a compact group,
the spheres of visibility overlap.这才是A的观点，对吧，后面的呢，是展开的一些论述。前面呢，是对一些Assumption的质疑，而a school of thousands of fish is highly visible就是Asmpt了，那中间那句呢？Even呢？