Thefirstpulsar,orrapidlyspinningcollapsedstar,tobesightedwasobservedinthesummerof1967bygraduatestudentJOcelny,butthediscoverywasnotannounceduntilFebrury1968.划分每个逗号分句的句子成分,哪个是主句～插入

Question

The first pulsar,or rapidly spinning collapsed star,to be sighted was observed in the summer of 1967 by graduate student JOcelny,but the discovery was not announced until Februry 1968.划分每个逗号分句的句子成分,哪个是主句～插入语～状语 等

Answer 1

这是个句子中是两个并列成分,都用的是被动语态.若还原成主动句形式应该为 The graduate student JOcelny（主语） observed（谓语） The first pulsar（宾语）,or rapidly spinning collapsed star（插入语）,in the ...