And all sorts of climatic cycles have been proposed , says geophysicist Maria Zuber of MIT.不过大家都认为存在着所有类型的气候循环.The gravimetric crew usually consists only two persons, one geophysicist and one topographer.而且重力测量仪的操作仅需要两个人...
他们将集中教授阅读、写作和算术基础知识。They will concentrate on teaching the basics of reading, writing and arithmetic.他用这个节目的录像带教授英语。He uses tapes of this program to teach English.这本书对于教授文学的老师来说帮助非常大。The book is an invaluable aid to teach...