CHECK-IN

Check-in可以指

  1. Broll, W.; Ohlenburg, J.; Lindt, I.; Herbst, I.; Braun, A. K. . . 2006: 28. ISBN 1595935894. doi:10.1145/1230040.1230097.
  2. Richmond, Riva. . The Wall Street Journal. Dow Jones & Company, Inc. September 10, 2010 [September 30, 2010]. (原始内容存档于2020-07-27).
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