Unhappyparentsrarelyareprovokedtowonder这是主句部分；iftheyshouldn’thavehadkids这个是做wonder的宾语成分,因此事宾语从句；butunhappychildlessfolksarebotheredwiththemessagethatchildrenarethesinglemostimportantthingintheworld:obviouslytheirmiserymustbeadirectresultofthegapingbaby-sizeholesintheirlives.这整个部分是和前面部分并列的,称并列句.unhappychildlessfolksarebotheredwiththemessage这是后面部分的主句.thatchildrenarethesinglemostimportantthingintheworld:这个部分是做message的同位语成分,起解释说明的作用.obviouslytheirmiserymustbeadirectresultofthegapingbaby-sizeholesintheirlives.这部分是同位语从句中的一部分.

　　不知道这样你看明别没有啊?