VOA慢速英语:移动互联网给古巴带来了快速变化

tornado - n. a violent and destructive storm in which powerful winds move around a central point

app - n. a computer program that performs a special function

roof - n. the cover or top of a building, vehicle, etc.

fiber optics - n. thin threads of glass or plastic to carry large amounts of information in the form of light signals

access - n. a way of getting near, at, or to something or someone