For standard validations like checking the name, length and format of an attribute, we can make use of validations provided by Active Record.
对于标准的检验(比如检查属性的名称、长度和格式)，可以使用Active Record提供的检验。
2
As chunks are allocated from an active, fixed-length storage pool entry, eventually the space in that entry runs out.
由于从一个活跃的、固定长度的存储池条目分配了块，最终该条目中的空间耗尽。
3
The theory of statistical dislocation link length distribution is an active field in the modern microscopic quantitative theory of metal plastic deformation.