Affected by electromagnetism and structure, the rotor shaft of big length to diameter ratio high power density asynchronous motor shows low intensity and bad rigidity.

大长径比高功率密度电机受电磁及结构因素的影响，转轴的强度低，钢度差。

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But that results the high void ratio, low density, hardness, and quality bulk material.

但是采用此方法所制得的块体材料致密度小，孔隙率高，硬度值较低，性能较差。

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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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High population density, a poor ratio of available water to demand, and regional imbalances in available water supplies are serious challenges for China in managing its usable water supply.

FORBES: Quenching China's Thirst For Water

Additionally, the 16:9 ratio allows for viewing more information at a glance and the device's high pixel density of 313ppi and Stripe RGB IPS Panel offers sharper and crisper text.

ENGADGET: LG's Optimus 4X HD officially making its way to European locales June 11 (update)