托福写作考试题目有很多表述自己观点,有可能会用到一些抽象词汇,所以大家可以提前进行了解,下面小编为大家整理了托福写作中实用的抽象词用法,希望对大家的词汇积累有帮助。

  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)

托福写作中实用的抽象词用法介绍

  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)

  2012托福写作考试必备抽象词: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.

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