Curry Rogers said cellular and chemical details in the fossils all show relative speed of growth.

库里·罗杰斯说，化石中的细胞和化学细节都显示出相对增长的速度。

On Wednesday, the comet will pass between the orbits of Earth and Mars at a relative speed of 207,000 kilometers.

周三，这颗彗星将以20。7万公里的相对速度通过地球和火星之间的轨道。

With about 7,500 metric tons of defunct spacecraft,spent boosters, and discarded equipment orbiting our planet at relative speeds up to 56,000 kilometers per hour,even small objects can be highly destructive.

大约 7, 500 公吨报废的航天器、用过的助推器和废弃设备以高达每小时 56, 000 公里的相对速度绕地球运行， 即使是小物体也可能具有很强的破坏性。