preset time的用法和樣例：
例句
- In a given period of time the new machine producedtwice as much as the old one.
在給定時間內新機器的產量是舊機器的兩倍。 - I'm afraid we're running out of time.
恐怕超過預定時間了。 - We can set different floors or room temperature at the scheduled time according to different living habits through the control panel.
我們可以通過控制面板根據生活習慣設定不同房間或者不同樓層在預定時間的溫度。
