石膏线条本身就不防水，遇到雨水和阳光就会风化，强度低，耐候性差，不能在室外运用，并且精确度差，没有保温功用。
Plaster line itself is not waterproof, rain and sun will encounter weathering, low intensity, poor weather, can not be used in the outdoors, and the accuracy is poor, there is no insulation function.
只要有一层玻璃的形状差了仅仅千万分之一米，望远镜的精确度就会大打折扣。
If a glass layer's shape is off so much as a fraction of a micron, the scope's precision takes a mighty blow.
在我的案例中，因为我不能够用cookies或者页面跟踪代码去跟踪用户，所以相对而言，我的数据精确度比我期望的要差，这是因为日志文件分析方法的造成的。
In my case, I am not able to use cookies or page tags to track visitors, so my data is always going to be less accurate than it could be because of the way the log files are interpreted.
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