同样地，我们来看看沿着周期表往下走，当我们从一行到下一行时，比如，从氦到锂，我们看到了一个下落，从氖到钠也一样，我们看到这里有个下落。

Similarly we see as we go down the table, so as we're going from one row to the next row, so, for example, between helium and lithium, we see a drop; the same with neon to sodium, we see a drop here.

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大多数包装或经加工后的食品的营养明细表中都会标明单位食品的钠含量。

The Nutrition Facts label found on most packaged and processed foods lists the amount of sodium in each serving.

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不吃单位钠含量超过200毫克的食品，并仔细检查营养明细表中单位食品的含量再考虑你到底该吃多少。

Try to avoid products with more than 200 mg of sodium per serving. And check the Nutrition Facts label closely for the serving size - and consider how many servings you actually eat.

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