Engino探索STEM流體動力學：9歲以上教育工程玩具（可組6款模型）

The water channels and valves feel surprisingly sturdy for a plastic kit, and my 10-year-old actually understood buoyancy after testing the models in a tub. It's a smart way to make physics hands-on without needing a screen.

We built all six models over the weekend, and my son finally understands why boats float after seeing the hydraulics in action. The instructions were clear enough for him to work through on his own.

My 9-year-old is usually glued to a screen, but he spent two hours on the submarine model and kept explaining buoyancy to me at dinner. The instructions actually show why things float instead of just telling you where to snap each piece, which made a big difference. Six models means it didn't get to