Itwastheideaofsupportingacraftona'pad',orcushion,oflow-pressureair,ringedwithacurtainofhigherpressureair.句子成分

Question

It was the idea of supporting a craft on a 'pad',or cushion,of low-pressure air,ringed with a curtain of higher pressure air.
句子成分

Answer 1

主语It
谓语was
表语the idea of supporting a craft on a 'pad',or cushion
of low-pressure air,ringed with a curtain修饰pad or cushion
of higher pressure air修饰ringed with a curtain中的curtain