recombine

Then, if the mix of waste is correct, the carbon and oxygen atoms involved recombine to form carbon monoxide and the hydrogen atoms link up into diatomic hydrogen molecules.

接下去，如果废物的组合是合适的，碳原子和氧原子会重新组合形成一氧化碳，而氢原子则结合起来形成双原子的氢分子。