Explicit knowledge is the knowledge that can be fully expressed by humans in a certain code system (such as language, mathematical formulas, various charts, Braille, sign language, semaphores, and other symbolic forms). As opposed to tacit knowledge, it usually refers to people The knowledge that is known but difficult to describe depends on personal experience. Tacit knowledge based on the body refers to the tacit knowledge produced and applied by the subject in the process of cognition, which is more rooted in the use of human body functions or the use of tools. According to the above definitions, which of the following is the most typical one of the following behaviors using body-based tacit knowledge? ['A company has developed a set of financial software that allows users to simulate the situation of stock trading without spending cash.', 'Kindergarten teachers help children understand the meaning of some idioms through storytelling, analogy, etc.', 'A doctor with 20 years of surgical experience performs a bone marrow transplant on a patient.', 'Some researchers use the principle of buoyancy to make submarines and design streamlined shapes that reduce drag.']