Sulphur ejected into the atmosphere spread around in subsequent months to create a layer believed to have had a temporary cooling effect as it blocked some of the sun's warmth.
喷到大气层中的硫磺在随后几个月内将会产生一层大气，据称可以遮挡太阳辐射而产生暂时的降温效果。
A method of polyamide thin layer chromatography applicable to the separation and identification of blocked nucleosides, nucleotides and oligonucleotides is herewith described.
本文介绍了用聚酰胺薄层层析的方法，分离和检定带保护基的核苷、核苷酸和低聚核苷酸。
The sand coming from the layer is blocked around the sand control pipe when the water injection well is closed, therefore the purpose of control sands can been attained;
注水井停注时，地层外吐砂就会被金属毡阻隔在滤砂管周围，达到防砂目的。
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