The thickness of blood-air barrier was measured by image analyzer.

图像分析表明，气血屏障的厚度，随胎龄的增长而变薄。

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Inflatable packaging USES air pressure to secure and hold products in place inside the shipping container and provides an air barrier of cushioning.

充气包装利用气压来牢固及维持货件于托运容器内的位置，并提供一个气垫。

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Theseresults suggested that the concentration curve was determined mainly by the THOtransport across blood-air barrier in the primary pulmonary circulation.

结果说明呼出气氚水浓度曲线是氚水经肺首次循环时透过血-气屏障的转移所产生。

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Mulch forms a barrier between the soil and the air.

VOA: special.2009.06.30

And in 2007 a survey of around 200 space companies by the Air Force Research Laboratory cited export controls as the highest barrier to foreign markets.

ECONOMIST: Space technology

In addition, EPA's and USDA's relevant authorities cover a range of natural resources and their supporting ecosystems, including waters, sediments, barrier islands, wetlands, soils, land management, air resources, and drinking water supplies.

WHITEHOUSE: Executive Order -- Gulf Coast Ecosystem Restoration

Preventing this process using an iron-free, corrosion-resistant alloy barrier is particularly important in a city like Boston, where the air is damp and laden with salt water.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt