按住常开按钮以使电梯门保持开启状态，或请其他乘客帮你按下按钮。
Push and hold the DOOR OPEN button if doors need to be held open, or ask someone to push the button for you.
开门时间延长 Door opening timeextending按轿内的专用按钮，可使门在一段延续时间内保持内开门状态，从而便于装卸材料和行李等。
By pressing the specific button in the car , the door will remain open for an extend time to facilitate lading unloading.
开门时间延长 Door opening timeextending按轿内的专用按钮，可使门在一段延续时间内保持内开门状态，从而便于装卸材料和行李等。
By pressing the specific button in the car , the door will remain open for an extend time to facilitate lading unloading.
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