On the assumption that speed is kept constant, distance increases with time.

假如速度不变，则距离随时间增 大。

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Since the time when human beings were born on this earth, change has been a constant factor in life.

自人类在地球上诞生，变化更替一直是生命中不变的因素。

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Since those two results would contradict each other if the alpha constant varied with time, the constant must take on different values in different areas of the universe, the researchers concluded.

研究人员总结说，既然如果alpha常数随时间变化的话，这两种结果就会自相矛盾，那么该常数就必然在宇宙中不同的位置存在不同的值。

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We'll see in a few weeks how the UK Government responds to Part One, but the constant refrain throughout from Westminster has been - it's time for the Welsh Government to take on more financial responsibility for the money it spends, and not come begging for more handouts.

BBC: Commission keeps calm and carries on

In a context of constant pressure on economy, including on ship time budgets, we need to be inventive and set up win-win cooperations.

UNESCO: Building the Wealth of Nations

This means that if energy is required on a constant basis then the system needs to be backed-up by conventional sources of power 73% of the time, and there are days when the back-up system is required for more than 90% of the time (In Germany, the industry association insists that renewables uptime averages 10%).

FORBES: Why "Green Fossils" Matter So Much To Africa's Energy Future