真空结晶器属于外压容器，在使用过程中，经常因刚度不足而导致失效，使容器失去了原来的形状，从而影响生产的正常进行。
In the using process, no enough stiffness of vacuum crystallizer led to failure, so it lost the original shape and had a great influence on the normal control of production.
在从设计到使用的过程中，由于设计疏忽、施工失误、非正常使用、自然及人为灾害等因素的影响，房屋的结构承载力降低，从而影响建筑的安全使用。
Due to natural and manmade adverse condition such as miscalculation in design, construction or improper use, lots of buildings suffer structural carrying capacity, which undermines public safety.
经分析和应用表明，该模型能在不影响文件正常使用的基础上，使不同环境中的文件访问都能得到有效控制，从而保证文件的安全。
Analysis and application results show that access to files in different environments can be effectively controlled without influence of normal use, thus this model can ensure the security of files.
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