该电梯提供一个输出，用来表明电梯停在或者正在经过大楼的哪一层；该电梯还有一个按钮，按下这个按钮可以请求电梯到达其他的楼层；这个电梯可以在1～30层之间移动-This lift provides an output to indicate the elevator stopped on or through the building which is a layer the elevator there is a button, pressing this button may request