Advanced hospitals and high-level hospitals are different from grass-root hospitals, since they not only treat difficult diseases but also have the obligation of scientific studies and teaching.
高等医院、上层医院不同于基层医院，它们除了治疗高难度病症以外，还有科学研究及教学等任务。
The rate of chromosomal aberration in the workers working in grass root hospitals(0.421%) was higher than those working in upper level hospitals(0.083%).
基层医院放射工作者染色体畸变率（0.421%）明显高于上级医院（0.083%）。
The rate of chromosomal aberration in the workers working in grass root hospitals(0.421%) was higher than those working in upper level hospitals(0.083%).
基层医院放射工作者染色体畸变率（0.421%）明显高于上级医院（0.083%）。
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