So American Airlines announced a new "value pricing" plan, which entailed cutting fares while replacing complex discounts with a simple, four-tier price system.
因此美国航空公司对外宣布了一个新的“定价”计划。这个计划在削减票价的同时，还用一个简明的四列价格体系取代复杂的打折程序。
China a has a four-tier color-coded warning system for severe weather, with red being the most serious, followed by orange, yellow and blue.
中国对极端天气有一套四级预警系统，用四种颜色分别表示等级不同的预警，其中红色为最，其次是橙色、黄色和蓝色。 。
China has a four-tier weather warning system, with red representing the most severe, followed by orange, yellow and blue.
中国有一套四个等级的天气预警系统，红色代表情况最为严重，其次是橙色、黄色和蓝色。
China has a four-tier warning system for extreme weather, with red as the most severe, followed by orange, yellow and blue.
中国有针对极端天气的四级预警系统，最严重的为红色，其次是橙色、黄色和蓝色。
The system employs four-tier structure based on J2EE.
系统采用基于J2EE的四层结构。
Through the design of four-tier structure, the business core of the system processing capacity is enhanced, so that it can be operated with intelligence.
通过对信贷业务系统的四层架构设计，使得系统以客户为中心，并且增强了系统核心对业务的处理能力，做到一键式操作、智能化处理。
The USAF system has four tiers, and the lowest-altitude layer is the suggestively named tier N/A, which was carved out of tier 1 in prospective recognition of the unique qualities of mini-UAVs.
美国空军系统分为四层，高度最低的一层是建议名称为N/A层，小型无人机的独特性质正是该层区别于第一层的主要标志。
The USAF system has four tiers, and the lowest-altitude layer is the suggestively named tier N/A, which was carved out of tier 1 in prospective recognition of the unique qualities of mini-UAVs.
美国空军系统分为四层，高度最低的一层是建议名称为N/A层，小型无人机的独特性质正是该层区别于第一层的主要标志。
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