Normal company recruitment costs need not be managed by themselves, but are borne by the company. If the cost is too high, the employee's service period will be agreed, and if the employee breaches the contract, he will bear the corresponding liquidated damages. The most obvious is the pilot, who usually has to go abroad for training for about three years and costs millions. So after training, he usually has to sign a service agreement of about 10 years. If he can't do it, he will bear the training expenses.