So, that's probability density, but in terms of thinking about it in terms of actual solutions to the wave function, let's take a little bit of a step back here.

这就是概率密度，但作为，把它当成是，波函数的解，让我们先倒回来一点。

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The first step is knowing which foods are better options when it comes to energy density.

谈到能量密度第一步即应了解哪些食品更适合我们选用。

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Since the nanostructure is applied to a battery's cathode, he said, the next step is to study improving the anode, along with further increasing battery density.

他表示该奈米结构应用于电池的阴极，下一步是促进电池的阳极，并促进电池的储电能力。

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It's actually a slight step down in terms of pixel density, but the extra space is more than worth it, as now this can make for a passable video player.

ENGADGET: iPod nano review (2012)

"The results suggests that home cooks and restaurants could take an easy step toward obesity prevention by adding more fruits and vegetables and trimming the fat to decrease energy density without having to serve tiny portions, " she said.

BBC: NEWS | Health | Cutting down calories 'is easy'