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1·But often rules are unenforced or are not posted or don't exist at all.

不过大部分时候这些规定都是没有效力地，或者几乎不存在。

2·In the real world, the laws go unenforced and impunity is the norm, she said.

“在现实世界中，法律常常执行不力，犯罪却免予惩罚的现象十分正常，”她说道。

3·An unenforced relationship is represented in a database diagram by a dashed line.

非强制关系在数据库关系图中由虚线表示。

4·A technique to introduce (or inject) code into a computer program or system by taking advantage of the unenforced and unchecked assumptions the system makes about its inputs.

利用系统没有对其输入进行强制执行或检查的假设向计算机系统中引入(或“注入”)代码的技术。