The solutions for optical mass storage system and their principles are analyzed briefly, based on which, the key technologies for the improvement of the recording density are discussed.

在此基础上，扼要分析了现有提高存储器存储密度的思路及关键技术，给出当前国际先进水平的技术指标。

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Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.

根据在郑州进行的冬小麦根系田间实测资料，研究了根长密度和根质量密度在砂壤土中的垂直分布。

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Based on experimental apparatus, how the spray density and water temperature affected the heat and mass transfer performance of the evaporative condenser are studied.

在蒸发式冷凝器性能测试实验平台基础上，测试了水流参数如喷淋密度和水温对蒸发式冷凝器传热传质性能的影响。

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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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