实验设计的美妙之处在于它有效地排除了混淆变量；声学隔离确保了雌性只能对鸣声结构本身做出反应。
The beauty of the experimental design is that it effectively rules out confounding variables; acoustic isolation assures that the female can respond only to the song structure itself.
这个实验听起来很简单，但是实验的设计确实有一定程度的复杂性，因为研究人员不得不克服一些混淆变量。
The study sounds simple, but the design of the experiments was actually somewhat complex, because the researchers had to overcome a number of confounding variables.
很容易误以为bind是一种定义变量的方法，但这实际上不是它的作用(这是引起混淆的原因之一)。
It's easy to think of bind as being a way to define a variable, but that's not really what it does (and one of the points where you can get confused).
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