But cooking up these different elements gets harder as we move down and across the periodic table.

但是，随着我们在元素周期表中向下移动并跨越元素周期表，将这些不同的元素组合起来会变得更加困难。

You may think, salt is just a simple cooking element we shake on our food for a little extra taste. But salt is much more than that.

你可能会认为，盐不过是我们在食物上添加用以增加风味的简单东西，但盐的作用不仅于此。