保密

to keep sth confidential / to maintain secrecy

Bulgaria / Bulgarian / abbr. for 保加利亞|保加利亚[Bao3 jia1 li4 ya4]

to defend; to protect; to keep / to guarantee; to ensure / civil administration unit in the baojia 保甲[bao3 jia3] system (old)

secret / confidential / close / thick / dense

secrecy

non-disclosure agreement / confidentiality agreement