What should I do if the pruning shears are tight?

Shears for pruning trees cannot be used if you cannot open your mouth tightly. The first possibility is that it is useless for a long time. The fixing nails of the two pieces of scissors are rusty. Anti-rust oil can be dripped. The oil penetrates into the fixing nail and can be opened after lubrication. The second possibility is that the two blades of the scissors are too tight. Qiao Jiner can be used. Fix the nails in a hard slate. The vibration becomes loose at the beginning.