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1. By studying mineral grains found in material ranging from rocks to clay articles, previous researchers have already been able to identify reversals dating back 170 million years, including the most recent switch 730,000 years ago. 【译文】通过研究在岩石、陶器等材料中发现的矿物颗粒，先前的研究者们已经能够确认距今一亿七千万年前发生的的两级转化现象，包括发生在73万年前的最近一次两级转化。 【析句】复合句。主句previous researchers have been able to identify reversals dating back...,including...。主句中，dating back...为现在分词作定语修饰reversals。主句前，by studying mineral grains...是介词短语作方式状语，grains后found in material为过去分词作定语修饰grains，而material又有ranging from to...现在分词作定语。 2. Out of our emotional experiences with objects and events comes a social feeling of agreement that certain things and actions are good and others are bad, and we apply these categories to every aspect of our social lifefrom what foods we eat and what clothes we wear to how we keep promises and which people our group will accept. 【译文】与事物的感情经历使我们产生了一种社会认同感：对特定的事物和行为的好坏达成一致意见。并且将这种好与坏的分类应用于社会生活的方方面面，从我们吃的食物、穿的衣服到如何信守承诺以及与什么人为伍。 | 
