下面的句子成分实在搞不懂this continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.

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下面的句子成分实在搞不懂this continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.

下面的句子成分实在搞不懂this continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.
下面的句子成分实在搞不懂
this continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.

下面的句子成分实在搞不懂this continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.
start后面要加at,这里start是一个不及物动词.
a place是先行词,后面somewhere（关系代词）引出定语”near the 100-fathom mark“.
"(in the course of a few hundred miles) reaches the true ocean floor at 2500-3500 fathoms"是与"starts.mark"的并列成分,用and连接.（in the course of a few.）是状语
in the course of:In the process or progress of,在…期间,

this continental slope 为主语，谓语动词是starts at ，宾语为the 100-fathom mark ，地点状语in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.at a place 和somewhere 都表示地点为什么用两次，and后面明明接...

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this continental slope 为主语，谓语动词是starts at ，宾语为the 100-fathom mark ，地点状语in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms.

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这是一个并列句，用and连接。

 

  1. 共用主语是this continental slope；

  2. 谓语有两个，前半句的谓语是starts，即：this continental slope usually starts at a place somewhere near the 100-fathom mark. 其中at a place somewhere near the 100-fathom mark整体为地点状语，而near the 100-fathom mark是介词短语作为后置定语修饰a place，somewhere是修饰near的副词。所以，这前半句的意思是：这一大陆坡通常由水下大致100英寻线的某处起始。

  3. 后半句的谓语是reaches，即：this continental slope  in the course of a few hundred miles reaches the true ocean floor at 2500-3500 fathoms. 其中in the course of a few hundred miles 是这半句的状语前置，in the course of 的意思是“在…期间，在…过程中”；宾语是the true ocean floor；地点状语是at 2500-3500 fathoms。这后半句的意思是：（这一大陆坡）逐渐向海底延伸了几百英里，最后在水深2500-3500英寻处才到达真正的海床。

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