The copier jammed again just before my presentation, so I printed the slides downstairs.

影印機在我簡報前又卡紙了，所以我到樓下去印投影片。

Please call maintenance if the loading dock door jams while trucks are unloading shipments.

卸貨時如果裝卸區的門卡住，請打電話給維修部門。

A customer reported that the ticket machine at the station jammed and kept her card.

一位顧客反映車站的售票機卡住了，還把她的卡吞了進去。