VOA慢速英语:Sunshine Can Improve Cancer Odds(翻译)

prognosis – n. medical prediction of the future course of a disease and the chance for recovery.

osteoporosis – n. medical a medical condition in which the bones become brittle and fragile from loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D.

fragile – adj. easily broken or destroyed

brittle – adj. easily broken, cracked, or snapped <brittle clay> <brittle glass> <brittle bones>

fortify – v. to add material to (something) to strengthen or improve it <The cereal was fortified with vitamins.>