The phrase "a pair of back" is not correct in English.
Did you mean "a pair of backs"? If this is the case, you can use it when referring to two backs, typically in a context involving anatomy or sports.
Example: "The coach decided to recruit a pair of backs for the upcoming season to strengthen the team's performance."
Alternatives: "two backs" or "a couple of backs".
A middle-frequency magnetron sputtering system was designed and constructed for GaN growth, in which a pair of back cooled pool-shaped twin magnetrons were used for Ga metal targets.
The lack of goals by the interval had to be attributed to a pair of back fours who are improving and who coped well without a screen of curmudgeonly midfielders ahead of them.
Biles launched into a pair of back handsprings that took her from one end of the beam to the other, at which point she leaped high enough into the air that as she flipped upside down twice, twisting a full revolution along the way, her dangling ponytail would have grazed the top of a basketball hoop.
Mechanical spinning is achieved by passing fibre strands known as a 'Roving' through the nip of a pair of back rollers on the spinning frame, then through the nip of a pair of front rollers driven at a higher speed.
U.S. tour dates kick off with a pair of back to back, sold-out shows at San Francisco's legendary Fillmore on April 12 and 13.
It's important to ensure you keep a pair of back up fold away flats with you.
In November 2010, a pair of back-to-back bomb attacks in different parts of the capital killed another nuclear scientist and wounded one more.
Ian Bell immediately set England's chase in motion with a pair of back-foot drives to the cover rope in the first over from Shaun Tait.
In a pair of back-to-back bombings April 30, the bomber pretended to be a journalist who was covering a previous blast at the same spot.
Valentine is leaning toward having ARMANDO REYNOSO and MASATO YOSHII share a turn until a pair of back-to-back doubleheaders, Aug. 20-21.
This seems to be the same murderous troupe that Daryl dealt with in the woods when trying to help a pair of back-stabbing runaways.
