groundwork

n [U] ~ (for sth) preparatory work that provides the basis for sth 为某事打基础的准备工作.

ground, ground control, ground crew, ground floor, ground rule, ground speed, ground staff, ground swell, ground-bait, ground-nut, ground-plan, ground-rent, grounded, grounding, groundless, groundlessly, grounds, groundsel, groundsheet, groundsman, group, group captain, group practice, group therapy, groupie, grouping, grouse, grove, grovel, groveler, grovelling, grow, grow on, grow out of, grow up, grower, growing, growl, grown, grown up,