trace heavier
跟踪重
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Dr. SCHAWINSKI: So, in the very early universe, most of the elements that were made in the Big Bang were hydrogen and helium, and very few trace elements of heavier elements, like oxygen and iron and so forth.
NPR: What Makes Our Solar System Special?
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