動詞 sign in:

1. announce one's arrival, e.g. at hotels or airports
   同義詞：check in

1. Harrison also has promoted legislation to require immigrant businesses to post signs in English, which infuriated Asian business people but played well among longtime white residents.
   哈里遜又促使立法規(guī)定外國移民所開商號懸掛英語招牌。此舉令亞裔商人異常憤怒，但深為長久居住此間的白人所喜。
2. Members must sign in any guests that they bring to the club.
   俱樂部成員必須為其帶到俱樂部所有客人們登記。
3. Every girl must sign in when she comes back to the dormitory.
   每個女生回到宿舍的時候都必須簽到。