惟一

• Tom is the sole support of his old mother
  汤姆是他老母亲惟一的赡养者。
• On uniqueness of the solution of a morphism equation
  态射方程解的惟一性
• He is the only support that his poor old mother has
  他是他的可怜的老母的惟一的赡养者。
• Achievement provides the only real pleasure in life . - - -
  有所成就是人生惟一的真正乐趣。
• However , this isn t the only way to solve the problem
  但是这并不是解决问题的惟一办法。
• Love , the sole disease thou canst not cure
  爱是你惟一无法治愈的疾病
• The only thing you have to do is （ to ） press the button
  你所要做的惟一的事是按一下按钮。
• The only field you need to add is the
  需要添加的惟一字段是string类型的
• Primary key , foreign key , unique , and check constraints
  主键、外键、惟一性约束和检查约束
• You need to generate unique values for the surrogate key
  首先需要为代理键生成惟一的值。