一般情况下，DOM实现必须检验操作的正确性，并在应用程序传递错误参数或者执行非法操作时抛出异常。
Normally, a DOM implementation must verify the correctness of operations and throw an exception if an application passes the wrong parameters or performs an illegal operation.
某个活动的多次出现，不一定会导致流程执行错误，但是它会影响模型的可读性。
Multiple occurrences of an activity do not necessarily lead to a process execution error, but they can affect the readability of the model.
还需要能够跟着错误和程序输出，并需要能够确保脚本的执行环境的安全性和有效性。
You also need to be able to trap errors and output from programs and ensure the security and validity of the environment in which the script executes.
它是有表达力和行动力的，但当表达和行为被错误地指导、或错误地执行的时候，结果很可能是灾难性的。
It is expressive and active, and when expression and action are ill advised or poorly executed, the results can be devastating.
早期系结减少执行阶段错误的次数和严重性，因为它允许编译器在编译程序时报告错误。
Early binding reduces the number and severity of run-time errors because it allows the compiler to report errors when a program is compiled.
早期系结减少执行阶段错误的次数和严重性，因为它允许编译器在编译程序时报告错误。
Early binding reduces the number and severity of run-time errors because it allows the compiler to report errors when a program is compiled.
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