文档介绍：长难句结构分析
主语宾语 np1
主谓语动词 n+1
先主干后修饰 np1 V np1
S=np1 of np2 on np3 that v1 o1 V O=np1 of np2 that v1 o1, which v2o2.
先主句后从句 Although SVO,SVO.
长名词短语(LNP)
NP1 of NP2 on NP3 in NP4
NP1 of NP2 of why S V O
NP1 of NP2, done by…, to NP3
NP1’s NP2 to NP3 about NP4
His NP1 of NP2 over NP3
抓住第一实义名词
LNP:
Between the early 1870’s and the 1890’s, the mounting agrarian discontent in America paralleled the almost uninterrupted decline in the prices of American agricultural products on foreign markets.
LNP:
A critique of the Handlins’ interpretation of why legal slavery did not appear until the 1660’s suggests that assumptions about the relation between slavery and racial prejudice should be reexamined, and that explanations for the different treatment of Black slaves in North and South America should be expanded.
LNP:
[But] after more than a century of investigation, the relation of these and other phenomena, known collectively as the solar-activity cycle, to terrestrial weather and climate remains unclear.
LNP:
The absence of recorded sunspot activity in the notes kept by European observers in the late seventeenth and early eighteenth centuries has led some scholars to postulate a brief cessation of sunspot activity at that time (a period called the Maunder minimum).
一个逻辑层次: SVO
一层修饰: S(that)VO(that)
S V O
,NP/adj./as NP, adv. same as S
v-ed, v-ing to v. such as
that/which/who by v-ing
,NP that…,

# S=that SVO; O=that SVO.
S(that) V O(that):
The ease with which a fish can reverse the effect of the sidedness of its eye asymmetry simply by turning around has caused biologists to study internal anatomy, especially the optic nerves, for the answer.
S(that) V O(that):
The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance of changes in the conditions and consequences of international trade that occurred during the second half