动词短语
中文翻译：Unknown
同义词：
['become obsolete', 'cease to be used', 'become unusable']
例句：
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1. The old car has fallen out of use in our town.
这辆旧车在我们镇上已经落伍了。
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2.The software has fallen out of use because it's too difficult for the new users.
这个软件已经落伍了，因为它对新用户来说太难用了。
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3. The old model phone has fallen out of use because of its poor performance.
这款旧手机因为性能不佳而落伍了。