这个模型描述了气溶胶的光学厚度（一个衡量光在气溶胶里分散和吸收的物理量）以及气溶胶代替空气分子的程度。
The model depicts aerosol optical thickness, a measure of the amount of light that the aerosols scatter and absorb, and a proxy for the number of particles in the air.
海冰覆盖范围及其厚度是衡量北极健康状况的指标。
The extent of sea ice cover and its thickness are measures of the health of the Arctic.
他们还进行了超声波和其他测试，衡量血管的作用和动脉血管的厚度。
They also did ultrasound and other tests to measure blood vessel function and the thickness of the artery wall.
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