Top speed is fifteen kilometers an hour, and the Soleckshaw does not pollute.

VOA: special.2009.05.11

The electron is not moving at the speed of light.

电子不是以光速运动的。

麻省理工公开课 - 固态化学导论课程节选

The fact that you don't need a force for it to move forever at a given speed in a given direction, that's not obvious, because in daily life you don't see that.

对于物体不需要力的作用就能保持,确定的速度和方向持续运动这一事实,它并非显而易见,因为在日常生活中你看不到这种情况

耶鲁公开课 - 基础物理课程节选

The goal was not to set a speed record.

VOA: special.2010.05.26

But some Democratic lawmakers contend the long-term key to defeating the insurgency in Afghanistan is not to send more foreign troops, but to speed training of Afghan security forces.

VOA: standard.2009.10.25

But he says speed is not necessarily the number-one priority.

VOA: standard.2010.05.10