What you have left is one image open with your multiple layers, in my case 3, each layer containing exactly the same shot just taken with a different exposure all sandwiched on top of each other.
你现在有的是一个有着好几个层的图片，我的例子是3个层，每个层有一个不同曝光的但是拍摄同样景物的图片，他们象三明治一样一个叠在另一个上面。
All the various layers of software that the server calls must be safe to be called on behalf of more than user at the same time.
服务器调用的各个软件层次必须在同时为多个用户调用时都能保证是安全的。
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