What about jam jars that can't unscrew the lid?
It can be turned on with a professional tool. If not, try heating the jam bottle. If not, then don't eat jam for breakfast.
Shake the jam jar and twist it again
This is very easy, a bowl of boiling water (or high temperature Wen Kaishui), will jam the bottle upside down in 2-3 minutes after take out it is easy to open. Other especially iron or iron pot lid can be modeled on the east.
