过去给水族馆的水过滤和充氧的尝试都已失败了。
But bats, we thought they were filtering out this kind of information, because they simply couldn analyze it.但至于蝙蝠,我们认为它们过滤掉了这类信息,因为它们根本无法分析这些信息。
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.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。