In practical terms, the lack of available time seems to be, and often is, a valid reason for why we cannot take something on.

在现实中，缺少时间似乎是，并且经常是我们不能做某事的正当理由。

youdao

So, hopefully that kind of clears up that question. And, of course, when the velocity actually is zero, this equation that the de Broglie has put forth is valid for anything that has momentum, so if something does not have any velocity at all, it actually does not have momentum, so you can't apply that equation anyway.

能回答你的问题，当然，如果速度真的是零的话,德布罗意提出的这个方程,只对有动量的物体成立,所以如果一个东西没有速度，它没有动量，也就不能应用这个方程。

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In reality those 3 reasons are just spurious excuses, not valid reasons for doing something.

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Must be, otherwise no one could have a patent valid in 2012 for something that has been around since 1972.

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All of these are extremely valid points, and something for everyone to consider.

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