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Why is the nail worker's salary so high?

I'm tired from work.

The high salary of nail-making workers is due to the fact that nail-making factories pay attention to the grasp of the whole process, require high yield of the whole nail-making process, and ensure the quality and quantity, and the nail-making union is tired, so the salary will be very high.

Nail gun is a kind of nail gun that uses compressed air as power.