The erasable optical disk with high recording density, high stability, high data transfer rate, high carrier-noise ratio and low error rate arc the main points in the research and development.

当前的研究与开发的重点是具有高记录密度，数据传输速率快、稳定性好、载噪比大和误码率低的可擦型光盘存储材料。

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It provided theoretical and practical bases for the development of new low cost low density heat resisting and wear resisting metal based composite by simple and convenient fabrication.

为开发耐热、耐磨、成本较低、制备较为简便的新型低密度金属基复合材料提供了理论和实验基础。

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Research scientists suspect that various oxidised forms of what is known as bad cholesterol, LDL (low-density lipoprotein), contribute to the development of the disease.

科学家们怀疑多种氧化方式的低密度脂蛋白导致了这种疾病的发生，低密度脂蛋白被人们称之为坏胆固醇。

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The result is scattered, low-density development that keeps affordable housing out, increases the cost of infrastructure, separates inner-city residents from new jobs in the suburbs, and makes public transport less efficient.

ECONOMIST: Urban planning