冰层的厚度显示一年中降了多少雪。
The thickness of layers reveals how much snow accumulated in a year.
这张图片显示了不同人中的头发厚度，左边的头发是高加索白人女性的头发，右边是亚洲男性的头发。
This image shows the difference in thickness of human hair between different ethnic groups. The strand of hair on the left is that of a Caucasian blond female.
下方的第一幅地图显示了今年一、二月海冰的平均厚度，当时正值冰盖到达每年最厚的时候。
The first map, shown below, shows the average thickness of the sea-ice in January and February this year, as the ice approached its annual maximum.
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