open transition autotransformer starting

例句：

1. 1. The door is open;please come in.
   门是开着的，请进来。
2. 2. The window is open; let the fresh air in.
   窗户是开着的，让新鲜空气进来。
3. 3. The library is open from 9 am to 5 pm.
   图书馆从上午9点到下午5点开放。