He is busy writing an

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article
名词 n.[C]
1.(物品的)一件;物品;商品
She had several articles of clothing in her bag.
她手提包内有几件衣物.
2.文章;论文
He has written an article for the magazine.
他已给该刊撰写了一篇文章.
3.条款,条文
Article 15 of the constitution deals with this problem.
宪法的第十五条款谈此问题.
4.冠词The article is a part of speech in the English