这不意味着用例模型只能够包含来自于前景的元素。
This doesn't mean that the Use-Case Model can only contain elements from the Vision.
在焰火表演开始前考虑一下画面中的前景和背景元素，并想想怎样将它们组合起来。
Before the show begins, think about the foreground and background elements of the scene and how you might want to incorporate them.
拍照小技巧：给你的构图分层——也就是说，给拍摄主体添上多种元素，例如前景和背景元素等。
Photo tip: Add layers to your composition-that is, multiple elements beyond the main subject, such as foreground and background elements.
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