程序实际上不会在真空中工作-在某个环境中是安全的程序可能在另一个环境中就不安全了。
Programs never really work in a vacuum — a program that is secure in one environment may be insecure in another.
今天，大多数程序都是在一个环境(通常是由开发者为该项目特别定制的)中编写，然后在另一个环境中测试，最后又部署到另一个环境中投入生产。
Today, most applications are coded in one environment (usually custom-built for that project by a developer), then tested in another, and redeployed to yet another for production.
对于嵌入式应用程序，另一个关键需求是能够在模拟环境中或直接在目标设备中运行。
Another key requirement for embedded applications is the ability to run either in an emulated environment or right on the target device.
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