Additionally, there are Optional Rules that you may set for your coupon, they include.
另外，还有一些供您设置优惠券的可选规则，包括。
Most of the rules, advice, and conventions that govern the way we work deal with these optional bits.
大多数的规则、建议和惯例约束着我们处理可以选择的工作的方式。
These rules describe, for example, which elements are valid, the order of elements within a document, the data types of attributes, whether an element is required or optional, and so on.
这些规则定义哪些元素是有效的、文档中元素的次序、属性的数据类型、一个元素是必需的还是可选的等等。
Tougher times have eroded cash balances and, with less money in their pockets, many Italians may have ignored the tighter rules and continued thinking that taxes are optional.
现金已经被这个艰难的时代腐蚀了，并且由于人们口袋中剩下的现金不多，很多意大利人无视这些严厉的规定继续认为纳税是有选择性的。
Usage (optional) — Information about how to use the term, and any business rules that govern its use.
Usage(用法，可选)——关于如何使用这个术语的信息，包括控制它的用法的任何业务规则。
Making semicolons optional for some rules while keeping the trailing semicolon optional?
制定一些规则可选分号同时保持分号结尾的可选？
Betterness rules on conversions are only applied for arguments that are explicitly given – omitted optional arguments are ignored for betterness purposes.
转换的最优原则只用于明确给定的实参——出于最优的目的，忽略掉的可选参数在重载解析时将不做考虑。
The number of kisses is optional, and as there are no rules on which cheek to kiss first, there are often clashes.
意大利式亲吻的次数是随意选择的，没有明确规定需要先亲吻哪一侧的脸颊，但是会经常撞头。
What is generally referred to as improvisation is "practiced improvisation" in which you have practiced a set of optional changes to pick from, and these changes usually follow a set of rules.
通常所说的即兴演奏，实际上是“经过练习的即兴演奏”，即你对乐曲的几种可资选择的变化预先进行练习，而这些变化是遵循一定的规律作出的。
In therory the amount of tips is optional, but in many places of Ameica, there are some unwritten rules on tipping.
理论上小费给多少纯属自愿，但是在美国，不少地方都有不成文的规矩。
In therory the amount of tips is optional, but in many places of Ameica, there are some unwritten rules on tipping.
理论上小费给多少纯属自愿，但是在美国，不少地方都有不成文的规矩。
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