Dian Xiaoer
The literal meaning of Dian Xiaoer refers waiters who worked at a restaurant or inn. But it now refers to officials or governmental departments who handle economic development and offer sound service for companies.
Officials from the Shanghai stressed that "the government should strive to do a good job as a Dian Xiaoer." The spirit of "Dian Xiaoer" is the new role of government departments and cadres, and is a concrete measure to comprehensively deepen the reform in the new era.
Going by the book
The term refers to being "standard," "classic" and "perfect" in English. It started in May in a video, which records a Shanghai police who acted by the book to forcibly demand a driver's license.
Since the video went viral on social media, it has been frequently used to describe something done rather perfectly, for example, "a performance by the book" and "a design by the book." On many occasions, the term was used to depict something was done perfectly wrong, such as "a deception by the book."