Above that threshold, the SFR increases linearly with that surface density.

高于阀值时，SFR随表面密度线性增长。

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The surface density of galaxies in a cluster can be measured from photographs.

一个星系团中星系的表面密度可从其照片上测得。

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At maturity, lungs were excised and quantitative histology performed to measure alveolar air fraction and surface density.

在到期时，肺切除和定量组织学表现来衡量的一小部分肺泡的通气量和表面密度。

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To compare alien planets, Dr. Mendez at the Planetary Habitability Laboratory and his colleagues are creating an Earth Similarity Index that ranks worlds by their resemblance to our own planet, on a scale from zero to one, based on their mass, radius, density and surface temperature.

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Its delivery method is based on a well-characterized, FDA approved biodegradable chemical platform called PLGA. The company's nanoparticles incorporate a high density of attachment sites on their surface, enabling them to carry out multiple functions--like targeting tumors, enhancing diagnostic images, treating diseased tissue or concealing the whole package from the body's natural defenses.

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Due to its high density, a person would generally be expected to remain on the surface.

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