For each element we need to identify the best source for it.

对于每个元素，我们需要确定它的最佳来源。

youdao

Oysters: The best source of zinc, period.

牡蛎：锌的最佳来源，特别是经期。

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So what is the best source of antioxidants?

那么，什么是有抗氧化剂的最佳食物？

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Funding for Russia's best research institutes amounts to no more than five percent of comparable institutions in the United States, according to a source cited by Thomson Reuters.

VOA: standard.2010.02.03

Forbes readers are often the very best source of ideas for the articles I pursue.

FORBES: The Perfect Resignation Letter

Your best source of information is the hometown newspaper in which the debt was issued.

FORBES: Yankee Stadium Parking Garage Bonds Are Among Shaky Muni Bonds

He singled out technical obsolescence as his single-best source of short-selling ideas over the last 10 years.

FORBES: All Star Advice For A Turbulent Market