比例分层 Proportional layering ; Proportioning layering ; Proportionnos layering
阶、层例 level
分层比例抽样 stratified proportion sampling ; Stratified Proportional Sampling
保护臭氧层条例 Ozone Layer Protection Ordinance
不等比例分层抽样 [统计] disproportionate stratified sampling
估计的分层比例 [统计] estimated stratum proportion
物理层例如 wire radio fiber optic Carrier pigeon
传输层例如 TCP UDP RTP SCTP SPX ATP IL
按比例分层抽样的得益 [统计] gains from proportionate stratified sampling
在商业用例层，对于时间、花费，和资源的使用，进行期望值的设置，这些期望值可能在项目过程中定期的更新。
Expectations are set at the business case level for time, spending, and use of resources and may be updated periodically throughout the project.
这是一个挑战，因为您可能使用服务层来实现差别非常大的用例，从而导致服务层调用者在不一样的上下文中操作。
This is a challenge, since you could use the service layer to implement vastly different use cases, causing the service-layer caller to operate in dissimilar contexts.
在项目的需求阶段，分析师能通过提供一个更加正式层次的表达，把用例带入下一层次。
During the requirements phase of a project, analysts can take use cases to the next level by providing a more formal level of refinement.
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