这篇不是在讲微软的作业系统，而是家里那个普普通通窗口。
The windows in Germany are mostly this type:
在德国的窗口大多数都是这种的：
can be opened widely. And also slightly opened. During winter, you want some air ventilation but don't want to waste the heater energy, use this one~
可以开大大。也可以微微开，冬天的时候要空气流通，但是又不要开太大浪费暖气，就用这个。
Of course can be closed tightly also. The handle pointing downwards is closed tightly.
当然也可以关紧紧。手把向下就是关紧。
Handle pointing sidewards, the window can be opened widely.
手把向横就可以开大大。
Handle pointing upwards, the window can be opened slightly incline.
手把向上，上面就可以微微倾斜地开。
Outside that one is "blind". It's to block the sunshine. And with wholes so that won't be too stuffy.
外面那个当作窗帘用，拿来遮太阳的。有很多洞洞，这样就会通风。
A special phenomenon on the window is that it open inwards but not outwards~ what is the reason?
一个很特别的现象就是窗口都是向内开不是向外开的~什么原因呢？
One of the answer is to keep the building looks nicer without the window flipping outwards.
其中一个原因是不要窗口向外翻破坏建筑物的美观。
The second answer is because of safety reason. When the building is on fire, you might need to open the window to get some fresh air. According to the statistic, most of the people die in fire not because of burning but lack of oxygen. But if the window need to flip outwards to open, you might have difficulty because the air pressure inside is lower than outside. That's the reason why the window is flipping inwards.
第二个原因是安全原因。当一个建筑物火灾的时候，你可能会需要打开窗呼吸新鲜空气。据统计指出，大部分的人死于火灾现场中不是因为烧死而是缺氧而死。但是如果窗口是向外开的话，你可能会有困难，因为里面的气压会比外面的气压低。这个是为什么窗口要设计成向内开。
The third reason is that you can clean the window easily.
第三个原因是你可以很容易的清理窗口。
Of course it has also disadvantage. You must free the space in order to flip inward and waste some space inside.
当然也有坏处。你一定要空出位子来让窗口向内翻进而浪费了些许位子。
