事实上，我们推断蝙蝠在分析回声时过滤掉了很多因素，就像一个复杂的雷达系统可以忽略地面上静止物体的回声那样。
In fact, we kind of assumed that they were filtering a lot out, the way a sophisticated radar system can ignore echoes from stationary objects on the ground.
这些文化传播系统必定都受到生物因素的过滤。
These culturally-transmitted systems must all pass through the filter of biology.
这时候我们便拥有了过滤掉无关因素而把所需要的信息加以拼凑以完成一项工作的能力。
We're able to filter out extraneous facts and piece together only the necessary information for getting a job done.
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