A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal.

超大碰撞可能剥去了水星的一部分岩石地幔，留下了一个金属核心，其密度与原来的岩石与金属的比例相比大得不成比例。

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With increase of bed height, air pressure and power consumption rise, expansion ratio of the bed decreases, but the density stability and critical fluidized velocity of the bed are hardly changed.

随着床层高度的增加，所需风压及功率增大，膨胀率有所降低，而床层密度的稳定性和起始流化气速几乎不变。

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It is always a challenge of not able to get a good aperture ratio as the resolution density increases.

它始终是一个挑战，无法获得良好的孔径比为第密度增加。

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But accurately working out Mathilde's volume (necessary because density is the ratio of mass to volume) was harder.

ECONOMIST: Asteroids

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.

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