名词短语
中文翻译：自动过期
同义词：
['automatic lapse', 'automatic lapse of time']
例句：
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1. The policy will automatically expire after three years.
这项政策将在三年后自动失效。
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2. The deadline for the project has been automatically extended by two weeks.
项目的最后期限已被自动延长两周。
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3. The machine's automatic expiration feature is very convenient.
这台机器的自动过期功能非常方便。