A rare disease refers to any disease that affects a small percentage of the population.

罕见病是指极少数人才会生的病。

Most rare diseases are genetic and thus are present throughout the person's entire life, even if symptoms do not immediately appear.

大部分罕见病都是由基因决定的，因此就算症状不会立即显现，患者也会终身得病。

There is no cure for most rare diseases, but the appropriate medical care can improve the quality of life of those affected and extend their life expectancy.

大多数罕见病无药可治，但是采取适当的医疗措施会提高罕见病患者的生活质量，并延长其预期寿命。

来源同文世纪翻译，转载请注明出处！