symptom group的用法和样例：
例句
- Myelodysplastic Syndromes are a group of conditions that cause insufficient production of blood cells, which is often lethal.
骨髓增生异常综合征是一组条件不足，造成生产的血细胞，这往往是致命的。 - Conclusion Abdominalgia is a common clinical symptom for the patients with hemorrhagic fever with renal syndrome,the occurrence is closely related to the state of the disease.
结论腹痛是肾综合征出血热患者较常见的临床症状，与其病情密切相关。
