( )--(○○○)--(○○○○○○)--( )

问题描述:

( )--(○○○)--(○○○○○○)--( )
(△△)—(△△△△)—( )—( )

( ○ )--(○○○)--(○○○○○○)--( ○○○○○○○○ )
(△△)—(△△△△)—( △△△△△△)—( △△△△△△△△ )