passport意思.....(急!)

Passport: A thing that ensures admission to or the achievement of something - the sport utility vehicle seemed like a a passport to new adventures
Passbook:
A booklet issued by a bank to an account holder for recording sums deposited and withdrawn

pass·key
A key to the door of a restricted area, given only to those who are officially allowed accessA master key (萬能鑰匙)

1. 獲得成功、幸福等的手段2. password,passbook