(North American English also or British English, medical医学mononucleosis, British Englishglandular fever)
a disease that causes the lymph glands to swell(= become large, round and painful) and makes the person feel very weak for a long time导致淋巴结肿大(变得肿大,圆形和疼痛)并长时间使人感到虚弱的疾病