如果你想在英语中表达买鞋的小视频，你可以说：
"I'm watching a video about buying shoes."
或者你可以说：
"I'm watching a video that shows how to buy shoes."
如果你想描述更加详细的信息，你可以使用更多的细节来描述视频的内容，例如：
"I'm watching a video that gives tips on how to choose the right pair of shoes for your feet, and how to find the best deals when shopping for shoes onpne or in stores."
你也可以描述视频中展示的鞋子的类型，例如：
"I'm watching a video about buying running shoes. It's giving me some ideas on what to look for in a good pair of running shoes, and showing me some popular brands and models."
希望这些信息能帮到你！
"I'm watching a video about buying shoes."
或者你可以说：
"I'm watching a video that shows how to buy shoes."
如果你想描述更加详细的信息，你可以使用更多的细节来描述视频的内容，例如：
"I'm watching a video that gives tips on how to choose the right pair of shoes for your feet, and how to find the best deals when shopping for shoes onpne or in stores."
你也可以描述视频中展示的鞋子的类型，例如：
"I'm watching a video about buying running shoes. It's giving me some ideas on what to look for in a good pair of running shoes, and showing me some popular brands and models."
希望这些信息能帮到你！