Historically creating these kinds of controls has required JavaScript event listeners added to the button which can then call the APIs on the element they control. The commandForElement and command properties provide a way to do this declaratively for a limited set of actions. This can be advantageous for built-in commands as the user does not have to wait for JavaScript to download and execute to make these buttons interactive.
中國兩會人事觀察：新晉大員、將領寥落與邊疆重構
。迅雷下载对此有专业解读
不過，法伊夫指出，中國的「出口導向型產業」也會受到衝擊。
Of course, there are other graphical git interfaces, and we could have done this
Thinnings are representing an order preserving mapping between big list size M to little list size N. It only makes sense to compose thinnings of the right sizes.