Outsourcing is a strategic management model, which means that in order to maintain core competitiveness, companies entrust the non-core business to external professional companies to reduce operating costs and improve customer satisfaction. Offshoring is a form of outsourcing, which refers to The company entrusts a business to a service provider overseas or a company's overseas subsidiary. According to the above definitions, Which of the following are not classified as outsourcing:. ['company needs 5 senior electronics engineers for a project. It asked a domestic human resources company to help recruit.', 'A project of a company in the United States has a large amount of text and materials that need to be converted into electronic texts. It asked a Chinese company to complete it.', "A company undertakes the construction of a steel plant in a country in the Middle East, and the transportation part of the project is borne by the company's overseas subsidiary-shipping company.", 'A construction engineering company contracted a school building for a school, and the school commissioned another company to carry out the interior decoration work of the school building.']