挑选黑巧克力的时候要找那些质量好并且写明了可可含量百分比的品牌。

Look for good quality brands that tell you the % cocoa solids.

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合金中某一元素或组分的相对含量，通常用质量百分数或原子百分数来表示。

The relative content of a particular element or constituent (i) within an alloy, usually expressed in weight percent or atom percent.

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注：镍含量百分数按照质量百分数差减法计算。

Note: the content of Nickel in the table is calculated by the subtraction method in the percentage of weight.

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