reason

n.理由；理性：理智 vt.论证；劝说 vi.推理

realtor, realty, ream, reap, reaper, reaping-hook, reappear, reappearance, reappraisal, rear, rear-admiral, rear-view mirror, rearguard action, rearm, rearmament, rearmost, rearrange, rearrangement, rearward, rearwards, reason for, reasonable, reasonableness, reasonably, reasoned, reasoning, reassemble, reassess, reassessment, reassurance, reassure, reassuring, reassuringly, rebate, rebel, rebellion, rebellious, rebelliously, rebelliousness, rebellow,