名词
中文翻译：占位符
同义词：
['dummy', 'placeholder', 'stand-in']
例句：
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1. The website uses placeholders to indicate where content will be added.
该网站使用占位符来指示内容将添加的位置。
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2. The data was replaced with a placeholder while the system was being updated.
在系统更新期间，数据被一个占位符替换。
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3. The project manager used placeholders in the report to show progress without revealing specific details.
项目经理在报告中使用占位符来显示进度，而不透露具体细节。