不把某事告诉某人keep sth. a secret from sb.
严守秘密lock a secret in one's heart
兰室秘藏Lanshi Micang; Secret Book of Orchid Chamber
【生活】秘密隔室secret compartment
暗帐private ledger【会计】;secret ledger【会计】
保密工艺secret process
使某人知道某项秘密let sb. into a secret
不记名投票secret ballot