1. 商業(yè)中心已劃為專門區(qū)域；送貨車輛只在特定時間才能出入該地區(qū)。
   The commercial center has now been zoned off: delivery vans may only enter and leave at specified times.
2. 定時器一種計時器，尤指控制時間間隔并指示間隔結(jié)束的那種計時器，如爐子上的計時器
   A timepiece, especially one used for measuring and signaling the end of time intervals, as on a stove.
3. 可以訓(xùn)練動物定時等待喂食。
   Animals can be conditioned to expect food at certain times.
4. 定時吃藥，每天三次。
   Take the medicine regularly three times a day.

定的英語翻譯：

時的英語翻譯：