But even among the smartest bird species, there's still natural variation in brain size.
但是，即使是最聪明的鸟类，它们的大脑尺寸也存在自然变化。
One way to gain more sample variation is to increase the sample size.
增加样本方差的一种方法是增加样本容量。
They began to categorize the particles' size, variation in size, and structure.
现在他们开始尝试对颗粒的大小、尺寸和结构进行分类。
They began to categorize the particles' size, variation in size, and structure.
现在他们开始尝试对颗粒的大小、尺寸和结构进行分类。
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