VOA慢速英语:Your Bones Are Alive! Learn How to Keep Them Strong

literally – adv. in a completely accurate way a story that is basically true even if not literally true

fracture – n. the act or process of breaking or the state of being broken; especially : the breaking of hard tissue (as bone)

impact – n. the act or force of one thing hitting another

jumping jack – n. an exercise in which a standing person jumps to a position with the legs and arms spread out and then jumps back to the original position

alarm – v. to strike with fear

fragile – adj. easily broken or destroyed a fragile vase fragile bones

encourage – v. to inspire with courage, spirit, or hope

hormone – n. a natural substance that is produced in the body and that influences the way the body grows or develops

wither – v. to become dry and sapless; especially : to shrivel from or as if from loss of bodily moisture

soda – n. US : a drink made of soda water, flavoring, and some type of sugar