Because these galaxies' mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies.

因为这些星系的质量分布在更大的区域，它们每单位体积的恒星数量比传统星系要少得多。

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Computer simulations show that it is superior to the conventional approaches in most cases and thus is a good approach for narrow-band interference suppression in spread spectrum systems.

通过计算机仿真可以看出，在多数情况下它比传统方法的性能优越，这表明它是一种对于扩频系统中窄带干扰的抑制的好方法。

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There exists a big error for long spread seismic data process in conventional velocity scanning.

常规速度扫描在处理长排列地震资料时会出现较大的偏差。

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Word of the October alert was just the latest sign of the concerns U.S. officials have about the possibility al Qaeda or another terrorist network might gain access to a nuclear device -- either a nuclear weapon or a so-called "dirty bomb, " one that contains radioactive material spread by detonating a conventional explosive.

CNN: Nuclear weapon plot deemed not credible

Conventional theory, based on fossil evidence, suggests that this spread took place by land, via the Levant.

ECONOMIST: Out of Africa, always something new | The

They spread rapidly and are resistant to radiation and to conventional drugs, leaving patients with little hope of survival.

ECONOMIST: Cancer treatment