范本

liàn zì fàn běn

练字范本

a model for calligraphy

zhè ge guǎng gào shì chǎn pǐn yíng xiāo de yī gè fàn běn àn lì

这个广告是产品营销的一个范本案例。

The advertising campaign was a textbook example of how to sell a product.