Third, there's a lipid called an ionizable lipid.

第三，有一种叫做可电离脂质的脂质。

Here, " ionizable" means that when these particles are in the bloodstream, they're neutrally charged, which helps with their safety.

在这里，“可电离”意味着当这些粒子在血液中时，它们是中性的，这有助于它们的安全。

And even then, their ionizable lipids aren't even that different, which is reassuring, because when independent groups of scientists converge on similar solutions, it's easier to trust the result.

即便如此，他们的可电离脂质甚至没有那么不同，这令人安心，因为当独立的科学家小组聚集在类似的解决方案上时，结果更容易相信。

So, for example, Moderna and BioNTech, the company that partnered with Pfizer, they discovered different ionizable lipids, and that is the only important ingredient in their COVID-19 vaccines that differ.

因此，例如，Moderna 和与辉瑞合作的公司 BioNTech，他们发现了不同的可电离脂质，这是他们 COVID-19 疫苗中唯一不同的重要成分。