rigorous

a.严格的，严厉的，严酷的(气候条件)

Right Honourable, right of way, Right Reverend, right-handed, right-minded, right-mindedness, righteous, righteously, righteousness, rightful, rightfully, rightly, rightness, rights issue, rigid, rigidity, rigidly, rigmarole, rigor, rigor mortis, rigorously, rigorousness, rigour (US rigor), rile, rim, rime, rimless, rind, ring, ring binder, ring mains, ring off, ring out, ring road, ring up, ring-finger, ring-pull, ring-shaped, ringer, ringleader,