Examples of medical modalities include chemotherapy, radiotherapy, and drug therapy.治疗程式的例子包括化学疗法、辐射疗法和药物治疗。Professor Williams is one of the world's leading specialists in radiotherapy.威廉斯教授是世界上顶尖的放射治疗专家之一。General causes of thrombocytopenia include poor nutrition, infections, radiotherapy, and some drugs.导致血小板减少症的原因一般有营养不良、感染、辐射治疗和一些药物。