形容词
中文翻译：额外的
同义词：
['extra', 'additional', 'augmented']
例句：
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1.The additional cost of the new software is $500.
新软件的额外成本是500美元。
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2. We need to add an extra pair of shoes to our shopping list.
我们需要在我们的购物清单中增加一双鞋。
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3.The company has added several new products to its range recently.
该公司最近增加了几款新产品到其产品线中。