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1.previously adv.事先；以前
He may suddenly take a dislike to foods that he's previously enjoyed.
对以前爱吃的食物，他兴许突然就没了胃口。
2.trace vt.跟踪，追踪；追溯
The exhibition traces the history of graphic design in America from the 19th century to the present...
展览追溯了美国从19世纪至今的平面设计历史。
3.evolve vi.发展，进化
If living creatures can indeed evolve, then human nature cannot remain unchanged.
如果生物真会进化, 人性就不能永久不变。
4.frequently adv.频繁地，屡次地
The reality of mothering is frequently very different from the romantic ideal.
养育孩子的现实经常与浪漫的理想大相径庭。
5.significance n.意义；意思；重要性
Ideas about the social significance of religion have changed over time.
关于宗教的社会意义的看法已经随着时间的变迁而改变。
6.breakthrough n.突破
The company looks poised to make a significant breakthrough in China.
这家公司看来很有把握在中国取得重大突破。
