The cause of the opening and closing is probably the difference in light.

开启和关闭的原因可能是光线的不同。

youdao

Opening up the door, in the light of the corridor, I found stunningly that fahter was standing in front of me!

打开寝室的门，借着楼道里暗暗的灯光，我不禁一惊，竟是父亲！

youdao

It's the difference between opening your refrigerator door and the light is just on, versus opening your front door to find a dark apartment and then fumbling for the light switch.

这和打开冰箱门灯就会亮和打开前门发现一个黑暗的公寓然后摸索着去找电源开关的不同一样。

youdao

I sat up. I could see light from an opening.

VOA: special.2010.07.31

And every night, late at night, I turned the lock of his door and opened it C oh,so gently! And then, when I had made an opening big enough for my head, I put in a dark lantern, all closed that no light shone out, and then I stuck in my head.

VOA: special.2009.05.16

Standing at a nonthreatening four feet and weighing about 95 pounds, the C-3PO wanna-be can move around the house, flipping light switches, opening doors and doing simple tasks at tables and benches.

FORBES: Ten O'Clock Tech: Robots Dawning

About 80ft high, I'd guess, it is beautiful rather than vast - a rushing stream that catches the light from an opening in the forest canopy and plunges into a pool where there were two people bathing, and from which, surprisingly, they produced a large basket of freshwater crabs.

BBC: Following Graham Greene to Liberia's sacred waterfall

Few in that country can forget the impressive sight of Li Ning, himself in a track suit of his own design, being hoisted up at the Bird Nest stadium to light the torch during the opening ceremony of the 2008 Beijing Olympic Games.

BBC: Viewpoint: Why do so few Chinese brands go global?