open dualistic economics

例句：

1. 1. The door was open when I arrived.
   我到达时，门是开着的。
2. 2. She opened the window to let fresh air in.
   她打开了窗户，让新鲜空气进来。
3. 3. The book is open at page 50.
   这本书第50页是开放的。