【TED】筱冢肯尼思：我的簡單發明，旨在保護我爺爺的安全（筱冢肯尼思：我的簡單發明，旨在保護我爺爺的安全）。 (【TED】Kenneth Shinozuka: My simple invention, designed to keep my grandfather safe (Kenneth Shinozuka: My simple invention, designed to keep my grandfather safe))