It is difficult to promote the positions of Merck's regular employees, to keep interns, to change personnel greatly, and to enter the formal establishment. Many of them sign third-party contracts, so it is difficult to enter.

Merck is a company located in Kennyworth, New Jersey, USA, with about 70,000 employees worldwide. In 20 14, Merck's global sales reached $42.2 billion, and R&D's investment reached $6.5 billion.