双箭头 
double-headed arrow
- 我们不用双箭头。
Let's not put a double arrow. - 单击 Auto-Map 图标(Output Mapping 旁边的双箭头)定义返回值的变量。
Click the Auto-Map icon (double arrows next to Output Mapping) to define the variable for the return value. - 面向服务的架构通过提供所谓的“松散耦合”减轻了这个问题,在图中由黑色双箭头指示。
Service-oriented architectures alleviate that problem by providing what is called "loose coupling," shown here via the double-headed black arrows.
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