Okay. So you have this concentrated light source.

好的。所以你有这个集中的光源。

So, nut butters are a very concentrated source of calories.

所以坚果黄油是非常浓缩的能量来源。

In addition, chocolate is a concentrated source of calories, so I seldom eat it.

而且，能量高高的。

Fat is a concentrated source of energy.

脂肪是一种集中的能量来源。