I found that their beer was unscrewed by hand when I watched American TV series. Why doesn't domestic beer have such a design?

They can unscrew it because the design of the bottle mouth uses a screw cap, which is similar to domestic beverage bottles. There are 1 to 2 rings on the bottle mouth, and the bottle cap can be opened with a hard twist; Domestic beer production lines all use mechanical pressure to fix the lid of beer bottles on the bottle mouth. If they screw by hand, it will increase their cost, so there is no such thing. I come from Jinan. Recently, a Taishan puree was listed in Jinan for 28 days. It is designed with this screw cap, and it seems to be the only beer with screw cap design in China at present. Because this beer is opened in a different way, it is quite novel to drink it quickly.