托福阅读第二讲托福阅读长难句 1本节课授课目标 1.句子的主要成分 2.句子之间的逻辑关系 3.长难句综合分析 4.句子简化题的标识和出题形式 5.解答句子简化题2句子的主干句子的主干指的是句子的核心信息。包括句子的主要成分和主要的逻辑关系。长难句各个成分的识别：3定语从句 Over long periods of time, substances whose physical and chemical properties change with the ambient climate at the time can be deposited in a systematic way to provide a continuous record of changes in those properties overtime, sometimes for hundreds or thousands of years.4定语从句 The sheer scale of the investment it took to begin commercial expansion at sea re
