准备阶段大家可千万别小看这一阶段，如果没做好你的伸缩门安装根本没办法进行。我们之前就应该根据实际情况去定做伸缩门，等到货以后拆开包装，确认各个部件都齐全(尤其是五金配件)。
In the preparatory stage, you should not underestimate this stage. If you do not do a good job in installing your expansion door, you will not be able to do it at all. Before that, we should customize the telescopic door according to the actual situation. After the goods are shipped, we should open the package and make sure that all the parts are complete (especially the hardware parts).
之后准备好锤子、尺子、绳子、连接件、专用固件等，并清理地面，确认门洞的边角是否已经打磨平整。
Then prepare hammers, rulers, ropes, connectors, special firmware and so on, and clean the ground, to confirm whether the corner of the door has been polished flat.