阅读理解一定要有上下文，特定的语境决定了行文方式。原句：As they grow old, people also accumulate belongings for two other reasons: lack of physical and mental energy—both of which are essential in turning out and throwing away—and sentiment.分析：该句包含了并列结构被分割的情况。lack of physical and mental energy和sentiment 是并列结构，作two other reasons的同位语。但是被非限定性定语从句both of whi...
there is two reasons, 这句是句子的主干，是there be 句型。lack of physicl and mental energy,这句话是reasons的同位语，both of which are essential in turning out and throwing away，这句话是which引导的非限定性定语从...
