在 + 杂志 + 上
杂志 (zázhì) means "magazine" or "journal." It refers to a periodical publication containing articles, stories, or academic papers. In Chinese, academic journals are also often called 杂志.
这本杂志每个月出一期。
Zhè běn zázhì měi ge yuè chū yī qī.
This magazine publishes one issue every month.
我在一本时尚杂志上看到了这款包。
Wǒ zài yī běn shíshàng zázhì shàng kàndàole zhè kuǎn bāo.
I saw this bag in a fashion magazine.
他的论文发表在一本国际杂志上。
Tā de lùnwén fābiǎo zài yī běn guójì zázhì shàng.
His paper was published in an international journal.