听力文本

Recording 30
录音30
1. We've recently been doing some research involving mice. We were trying to find out what causes the cells in our body to age.
1、我们最近在做一些和老鼠有关的研究。我们尝试找出我们体内的细胞老化的原因。
Is it linked to diet or exercise? What we found was that if we allowed the mice no exercise, their cells deteriorated fairly rapidly, giving them a prematurely old body.
这和饮食或运动有关吗？我们发现，假如我们不让老鼠运动，它们的细胞退化地相对迅速，身体变得早衰。
The mice that did exercise, showed less change in their cell structure and so seemed younger.
运动的老鼠，其细胞结构的变化更小，看起来更年轻。
2. We've known for decades that pigeons can navigate using the Earth's magnetic field as a sort of compass. What we don't know is how this works.
2、我们几十年前就已经知道，鸽子能利用地球磁场作为指南针导航。我们不知道的是其工作原理。
In our research, we discovered that the pigeon's brain receives a signal from its middle ear that the brain then processes to determine both their direction and the strength of the magnetic field.
在我们的调研中，我们发现，鸽子的脑部接受来自中耳的信号后，开始处理信息，确定鸽子的方向和磁场强度。
Previously, it had been thought that it was the bird's beak that held the answer. But this has since been proven false.
在此之前，人们认为，答案在鸟喙处。但这已经被证明是错误的了。