1·The terrible constraint on organ transplantation is that every life extended depends on the death of someone young enough and healthy enough to have organs worth transplanting.
器官移植的可怕约束是，一个人生命的延长要依赖于另一个足够年轻、健康的人的死亡，因为只有这些人身上才有值得移植的器官。
2·In this activity, you add documentation to every element in the model, including every column, every table, every constraint, and every trigger.
在这种情况中，你把文档添加到模型的每一个元素中，包括每个列，每个表，每个约束和每个触发器。
3·If you must make a change that would be incompatible with a released version, for whatever reason, then there is a back door of temporarily disabling this constraint.
如果您必须做出一个变更，使它与发布版本不相兼容，不管是什么原因，那么就会有一个临时后门丧失这个约束的能力。
4·However, we are handling roles through JSTL, so we can define the constraint for all roles by adding the code in Listing 3.
不过，由于我们通过JSTL处理角色，因此我们可以通过添加清单3中的代码来为所有角色定义约束。
5·The subject of this constraint is customer.
这个约束的主体是客户。