名词
中文翻译：可用性
同义词：
['accessibility', 'accessibility', 'availability']
例句：
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1. The new software has significantly improved the system's availability.
新软件显著提高了系统的可用性。
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2. The train service is very reliable, with a high level of availability.
火车服务非常可靠，可用性很高。
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3. Availability of resources can be limited by factors such as distance and time.
资源可用性可能受到距离和时间等因素的影响。