形容词
中文翻译：Unknown
同义词：
['supplementary', 'supplementing', 'additional', 'augmenting']
例句：
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1. We need to add an extra pair of shoes to our shopping list.
我们需要在购物清单上增加一双鞋。
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2. The additional information will help us understand the situation better.
额外的信息将帮助我们更好地理解情况。
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3. They added an additional layer of security measures to their defense system.
他们增加了额外的安全措施来加强他们的防御系统。