是否具有同一的错误处理策略？
确保结合某一类型的错误处理策略，以处理万一客户端代码传入无效索引值的情况。
Be sure to incorporate some type of error-handling strategy to handle the chance of client code passing in an invalid index value.
该服务从三个方面向用户提供了错误处理策略：用户任务、系统级应用和系统级组件。
This service provides users with effective strategies in three aspects: user tasks, system-level applications and system-level components.
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