When used for a time, the lock may not be opened smoothly. Do not dip mechanical oil into the lock. Instead, slip some Frenchchalk or pencil fines into it.
The invention provides a medicine treating tympanitis, which comprises 100g fresh eel blood, 10g earthworm dried powder, 5g musk dried powder, 2g toadfish dried powder and 50g Frenchchalk.