User talk:Pbchao

Welcome to Wikipedia. We welcome and appreciate your contributions, but we cannot accept original research. Original research refers to material—such as facts, allegations, ideas, and personal experiences—for which no reliable, published sources exist; it also encompasses combining published sources in a way to imply something that none of them explicitly say. Please be prepared to cite a reliable source for all of your contributions. Thank you. Materialscientist (talk) 07:01, 18 February 2017 (UTC)

Please do not add or change content without citing a reliable source using an inline citation that clearly supports the material. The burden is on the person wishing to keep in the material to meet these requirements, as a necessary (but not always sufficient) condition. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Materialscientist (talk) 08:25, 18 February 2017 (UTC)