托福写作讲究多样化，单调枯燥不在现在的时代范围内。知道一些抽象主义的词语对写作是有帮助的。北京新航道小编总结了一些托福写作词汇，希望对考生有帮助。

　　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.

　　以上就是托福写作词汇中一些抽象主义的词语，希望同学们可以认真记忆。北京新航道小编预祝大家考试顺利，小编会继续发布考试信息，请同学们持续关注。

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