kaname ishidesu
1. It is a key stone.; It is important.
Noun
#727887
1. It is a key stone.; It is important.
1. keystone
1. Key stone; Foundation stone
1. Key stone; Essential component
1. Not a key stone.; Not essential.
1. Was a key stone; Was crucial
1. It was a key stone.; It was important.
1. Probably a key stone.; Probably crucial.
1. It was not a stepping stone.; It wasn't a key stone.
1. It is not a stepping stone.; It is not important.