sign in什么意思？？

signin，英语短语，美式音标为[sa_n _n]，意思为“签到；注册；登记；签收”。例句：All visitors must sign in on arrival。来客均须签到；The contract will be ready to sign in two weeks。这份合同两周后即可签字；The shop had a sign in the window：“Have your cards read here，$25。”那家商店的窗户上有个招牌，写着：“算命，$25”。