Yóu / yú / huàn / zhě / rén / shù / hěn / shǎo / kāi / fā / gū / ér / yào / wǎng / wǎng / xū / yào / zhèng / fǔ / zhī / chí

由于患者人数很少，开发孤儿药往往需要政府支持。

Because there are so few patients, developing orphan drugs often requires government support.