It all has to do with the complex chemistry in your skin.

这一切都与你皮肤中的复杂化学物质有关。

While the recipe is simple – milk, sugar and fat, plus flavours and colours – ice cream has a complex chemistry.

虽然配方很简单——牛奶、糖和脂肪，加上口味和颜色——冰淇淋的化学成分很复杂。

There's complex chemistry here happening in deep space because each peak on this graph corresponds to a different molecule and there are some molecules present that I suppose are quite obvious.

在宇宙深处发生着复杂的化学反应，这张图上的每个峰都表示一种分子，其中有几种分子是比较常见的。