Legal analysis: The contract terms stipulated in the contract law only serve as a suggestion. In real life, as long as a contract has the main elements, it will be effective even if some parts are not stipulated. Parties to the agreement may negotiate or sign supplementary terms together.

Legal basis: "Labor Contract Law of the People's Republic of China"

Article 3 The conclusion of a labor contract shall be based on legality, fairness, equality, voluntariness, consensus, and good faith principle. A labor contract concluded in accordance with the law is binding, and the employer and the employee shall perform the obligations stipulated in the labor contract.

Article 10 To establish a labor relationship, a written labor contract shall be concluded. If a labor relationship has been established but a written labor contract has not been concluded at the same time, a written labor contract must be concluded within one month from the date of employment. If the employer and the employee conclude a labor contract before employment, the labor relationship shall be established from the date of employment.

Article 36 The employer and the employee may terminate the labor contract if they reach consensus through consultation.