名词
中文翻译：备用程序
同义词：
['contingency', 'backup']
例句：
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1. In case of emergency, the fallback procedure is to shut down all systems and wait for instructions.
在紧急情况下，备用程序是关闭所有系统并等待指示。
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2. The company has a fallback procedure in place for when its main servers go down.
该公司已经制定了备用程序，以防其主要服务器出现故障。
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3. The engineers had to implement a fallback procedure to prevent the system from crashing during the upgrade.
工程师们不得不实施一个备用程序，以防止系统在升级过程中崩溃。