sign in
动词- To sign one's name on a list when entering a place, to indicate one's arrival. · In order to get into the office after hours, you'll have to sign in at the security desk.
- To take some action to access a secured program or web page on a computer; to log in.
来自图书馆
Ali returned a sign in the negative.
Ali drew himself up proudly, and then returned a sign in the affirmative.
The old man made a sign in the affirmative.
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