群速度

There is no obvious reason why the clusters should be moving at such breakneck speeds, unless they are experiencing an unusually strong pull from something beyond the visible horizon.

至今还没有找到明显的理由可以说明这些星系群为什么竟会以这种极快的速度来运动，除非它们正在受到某些不在我们可见视域内的物体的异常强大的引力的拖拉。

As Houston-area exterminators have learned, this allows them to reproduce faster than single-queen species, and makes it hard to kill the entire colony.

根据休斯顿灭蚁人员所知，在这样的组织结构下，&疯狂蚂蚁&的繁殖速度比单蚁后种群更快，要消灭整个蚁群也变得更加困难。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。