show-and-tell

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We found that having simple show-and-tell demonstrations was the most effective and easily managed approach.
我们发现简单的显示和解说的演示方法是最有效的并且最容易管理的方法。
Just this past January, three rocks were swiped from a van en route to a Virginia elementary school, on their way to a show-and-tell.
就在今年一月份，三块岩石被一辆大篷车送往弗吉尼亚的一所小学，以供展出和讲解，可是途中被盗。
huzhangao.blog.163.com
We spend some time each year in the United States, visiting friends and family—going to our grandson's school to be his "show-and-tell, " and tending to tax returns and medical checkups.
我们每年在美国度过一些时间，拜访亲友——到我们外孙的学校去作他的“展示和讨论”作业的主题，以及处理纳税申报单和做健康检查。

The Numismatic Club dinner concluded with a lively show-and-tell where members laid out some of their rarest and most interesting coins.
FORBES: Homo Numismatus
But the exemplary collection of Amatis, Stradivaris and Guarneris that Vermillion acquired in the 1980s made the museum a natural for a Cremona show-and-tell.
ECONOMIST: Celebrating a mighty era of violin-making
They have plenty of large SUVs that don't get great mileage, but they've used the Prius, their Highlander and their Lexus RX-400H hybrids to kind of show a halo effect and tell people to ignore the big trucks, you know, they don't have as many of those, according to advertising.
NPR: Hybrids and the 'Halo Effect' of Car Ads

a school activity for young children in which a child brings an object into the class and talks to the other children about it

Show and tell is a school activity in which children present an object to their class and talk about it.