What if the small tin box can't be opened?
Turn the tin box upside down and take a heavy shot of the bottom of the small metal box;
2. Invert the tin box and place the cover of the small box in hot water, using the principle of thermal expansion and contraction;
3. Use a very thin lid of tin box, insert it and do not move it, stay for a long time, wait a few minutes and then go up.
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