7. The inner ear is composed of delicate membranes which bear dense patches of specialized cells called maculae. Each of these collections of cells can carry a message to the brain. What message is carried by a macula depends upon how it is affected. The message which is carried is not, however, always connected with the hearing sense. For instance, a certain kind of tadpole can tell the depth of the water it is swimming in by the pitch of a tone which is produced by its own lungs.

　　7、内耳由脆弱的薄膜构成，它承载着密集的由被称作斑疹的特殊细胞构成的片。每个这样的细胞群都能够把信息传递给大脑，而斑疹承载怎样的信息依赖于它是怎样受影响的。但是被承载的信息并不总是与听觉相连。举个例子，有一种蝌蚪能感知它所游泳之处水的深度，它是通过某种自己肺部产生的声音的音调来判定的。

　　8. In the human and all other mammals, the macula has developed into an organ which can easily be seen. This organ is called the cochlea. This spiral shaped organ contains the macula itself and it is called organ of Corti after its discoverer. If you have ever seen a snail shell, you know how a cochlea looks.

　　8、对于人类和其他所有哺乳类动物来说，斑疹已经进化成为一种很容易看见的器官，这种器官称作耳蜗。这一螺旋形的器官包括了MACULAE本身，以及后来被其发现者称为CORTI的器官。如果你看到过蜗牛的壳，你就知道耳蜗的形象。

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