translation.en: It's because lipids are so tough, they can get preserved in sediment and last the hundreds of millions of years necessary, and be extracted and tell us who was there.
translation.zh: 这是因为油脂太粗糙了，它们可以通过沉淀物保存下来， 然后经过上百亿年， 被提取出来，还能告诉我们谁曾经在那儿生存过。