indispensable: adj.1.不可缺少的，必需的，重要的 (to; for)。2.不能撇开的，责无旁贷的。短语和例子Air and water are indispensable to life. 空气和水是生命所必需的。 an indispensable obligation 不可推卸的责任。-bility, -ness n.,-bly adv.
Primary strucure and identification of a home - keeping protein ( a73 ) were obtained by maldi - tof / ms and databases . protein a73 is a dna repair protein , named recn , which is indispensable protein in genetic recombination and recombination repair ( 2 )不同生长期的rt19的蛋白表达数量和种类约有80是相同的，证实rt19在正常的生理过程中大部分蛋白的表达是稳定的，即为持家蛋白(如a73 ) 。
