托福写作会用到很多词汇，抽象词也是托福写作备考中不可忽视的一类词汇，天道留学为大家整理常用托福写作考试必备抽象词，希望对大家有所帮助。
Periodic
用法：①ADJ. Periodic events or situations happen occasionally， at fairly regular intervals.
例句：They especially emphasized the need for natural， serene settings where hurried urban dwellers could periodically escape from the city. (2002-01)
例句：This periodic extinction might be due to intersection of the Earth’ s orbit with a cloud of comets， but this theory is purely speculative. (2002-08)
例句：Periodically， molten material wells out of the Earth’s interior to invade the surface layers or to flow onto the surface itself. This material cools into a wide variety of igneous rocks. (1999-01)
例句：The woolly mammoth， along- haired rhinoceros， and other mammals have been periodically exposed in the tundra of Siberia， the hair and red flesh still frozen in cold storage.(1997-12)
例句：Periodic exhibitions of the members’ paintings also included works by noted English artists of the day， borrowed from embryonic private collections in the city. (1999-10)
Peripheral
用法：① ADJ. A peripheral activity or issue is one which is not very important compared with other activities or issues.
例句：Over 100 designated areas exist around the periphery of the Carbbean Sea.(2000-01)
②ADJ. Peripheral areas of land are ones which are on the edge of a larger area.
例句：These are the central nervous system (the nerve cord mentions above)， consisting of the brain and spinal cord， and the peripheral nervous system， consisting of the cranial， spinal， and peripheral nerves， together with their motor and sensory endings.
希望本文对你有所帮助~预祝考试顺利！
>>点击查看托福写作备考全集合专题，阅读更多相关文章！
-
托福写作字数和实际得分关系深度分析 合理安排写作篇幅让文章内容更有料
托福考生对于写作部分的字数要求一直存有疑问。写得字数太少担心被扣分，写得太多时间又会不够用。如何才能把握好作文字数和实际得分之间的关系呢?本文将为大家深度分析托福写作字数和得分的关系，帮助大家了解托福写作的正确篇幅安排。
- 备考托福写作范文资料备考如何高效运用？这3个练习重点不容忽视
- 托福独立写作开头段写法基础4步骤讲解 循序渐进让高分作文开个好头
- 托福写作7种常用高分句型汇总分享 结合句式实例提升写作用句水平
- 托福写作机经正确使用方法技巧和注意事项一览 掌握用法才能发挥机经价值