分析句子各部分的成分,theconceptoftherocket,orratherthemechanismbehindtheideaofpropellinganobjectintotheair,hasbeenaroundforwellover2000years.这是全句

Question

分析句子各部分的成分,
the concept of the rocket ,or rather the mechanism behind the idea of propelling an object in to the air,has been around for well over 2000 years.这是全句

Answer 1

句子主语：The concept of the rocket
or rather (更确切的说）the ...to the air是对句子的解释,可以看成是主语的同位语
has been (系动词）
around（表语）
for well over 2000 years(时间状语）