Plastic has many natural variations but where was the first artificial plastic developed?

塑料有很多自然变化，但第一种人造塑料是在哪里制成的？

In some societies, they’re accepted as just a natural variation.

在某些社会中，它们被认为只是一种自然变异。

No? Well, geomagnetic activity, the natural variations in Earth’s magnetic field, it fluctuates in 11-year cycles.

嗯，地磁活动，地球磁场的自然变化， 它以 11 年的周期波动。

More on this topic shortly, but first, a question: Plastic has many natural variations but where was the first artificial plastic developed?

稍后再聊这个话题，但是首先是一个问题：塑料有很多天然衍生物，但是最早的人工塑料是在哪里被开发出来的呢？

Natural variation between people means the allowable limits for some substances must be reasonably generous, leaving room for athletes to boost them artificially.

人与人之间的自然差异意味着某些药物的许可限度必须够大，从而为运动员人为地提高自己留下空间。

Because such variations existed long before humans, the witnesses claim the current warming trend is also the result of natural variation.

由于这种变化早在人类出现之前就已经存在，目击者称目前的变暖趋势也是自然变化的结果。

This is not easy Dr. Bond says, for even unengineered weather is full of natural variations that she calls climate wiggles.

邦德博士说，这并不容易，因为即使是非工程天气也充满了她称之为气候摆动的自然变化。

This is despite the fact that there's a lot of natural variation in what a " normal" brainwave is, so neurofeedback practitioners are enforcing a subjective standard here.

“正常”的脑电波有很多自然变化，所以从事神经反馈的专业人员在这里强制实施一种主观标准。

Like cholesterol we make it ourselves and the natural variation and how much a person has in their blood. Some people have higher levels, other people have lower levels.

就像我们自己合成的胆固醇一样，赤藓糖醇也有自然差异，每个人血液中的含量也各不相同。有些人的水平较高，有些人的水平较低。

These new ways of thinking about dyslexia are part of a wider movement to embrace neurodiversity… the idea that brains are simply wired differently and that these natural variations don't mean they're lacking.

这些思考阅读障碍的新方法是接受神经多样性的更广泛运动的一部分，这种观点认为大脑只是连接方式不同，这些自然变化并不意味着它们缺乏。