Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

[Q]: The Surface Book 2 is a 2 - in - 1 PC designed and produced by Microsoft , part of the company 's Surface line of personal computing . It was unveiled on October 17 , 2017 and released on November 16 , 2017 . Starting on November 9 , one week prior to the release date , consumers were able to place a pre-order through Microsoft 's website . It succeeds the Surface Book released in October 2015 .
[A]: Surface Book 2


[Q]: For medical purposes , X-ray filters are used to selectively attenuate , or block out , low - energy rays during x-ray imaging ( radiography ) . Low energy x-rays ( less than 30 keV ) contribute little to the resultant image as they are heavily absorbed by the patient 's soft tissues ( particularly the skin ) . Additionally , this absorption adds to the risk of stochastic ( e.g. cancer ) or non stochastic radiation effects ( e.g. tissue reactions ) in the patient . Thus , it is favorable to remove these low energy X-rays from the incident light beam . X-ray filtration may be inherent due to the X-ray tube and housing material itself or added from additional sheets of filter material . The minimum filtration used is usually 2.5 mm aluminium ( Al ) equivalent , although there is an increasing trend to use greater filtration . Manufacturers of modern fluoroscopy equipment utilize a system of adding a variable thickness of copper ( Cu ) filtration according to patient thickness . This typically ranges from 0.1 to 0.9 mm Cu .
[A]: X-ray filter


[Q]: Couples Retreat is a 2009 American romantic comedy film directed by Peter Billingsley marking his directorial debut , and written by Jon Favreau , Vince Vaughn , Dana Fox , Curtis Hanson , and Greg Beeman . Vaughn and Favreau star with Jason Bateman , Faizon Love , Kristin Davis , Malin Åkerman , Kristen Bell , and Jean Reno . It was released on October 9 , 2009 , in the United States . The film was shot mostly on the French Polynesian island of Bora Bora .
[A]:
Couples Retreat