长难句:however,whether such a sense of fairness evolved independently in capuchins and humans,or whether it stems from the common ancestor that the species had 35 million years ago,is,as yet,an unanswered question.
2、stem作名词主要表示“茎(干)、词干、家系、干线”等。作动词时意为“滋生,阻止”。he put a huge effort into trying to stem the rebellion but to no effect.(他拼命想阻止叛乱,但是没有成功。)注意stem from意为“出现”或“形成”。the czech-german declaration on mutual relations and their future development closed some of the controversial issues in czech-german relations stemming from the past.(捷克与德国关于相互关系及未来发展的声明结束了两国关系中的一些历史争端。)