密码保护

password protection

secret / confidential / close / thick / dense

secret code / ciphertext / password / PIN

cipher; secret code / password; PIN

weight / number / code / to pile / to stack / classifier for length or distance (yard), happenings etc

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)

to protect / to defend / to safeguard / protection / CL:種|种[zhong3]

to protect