Qhov rooj thiab qhov rai kis tau tus pas nrig yog siv dav hauv lub qhov rooj thiab qhov rais hauv ntau lub tsev. Txawm hais tias nws yog tsev neeg lub tsev, lub tsev lag luam, lossis cov chaw pej xeem, tsuav yog xav tau los tswj kev qhib thiab kaw cov qhov rooj thiab qhov rais, qhov rooj thiab qhov rais kis tau tus pas nrig yuav siv tau.
Zuag qhia tag nrho, lub qhov rooj thiab qhov rais kis tau tus pas pas nrig yog ib qho tseem ceeb ntawm lub qhov rooj thiab qhov rais, thiab nws cov kev ua tau zoo thiab zoo cuam tshuam ncaj qha rau cov neeg siv kev paub thiab kev nyab xeeb ntawm lub qhov rooj thiab qhov rais. Yog li ntawd, thaum xaiv thiab txhim kho lub qhov rooj thiab qhov rais kis tau tus mob pas nrig, yam xws li nws applicability, zoo, thiab durability yuav tsum tau xav txog.
