就用strong行了。比较级是stronger,stronger and stronger 是越来越强壮
strong给你一个cliche,经常用到的:strong as an ox另外,如果说女的,可以委婉一点地说 fit.
strong和powerful都有强壮的的意思
strong; able-bodied; brawny; sinewy; sturdy; vigorous
强壮基本翻译strongrobuststurdyeuatheniasthenia