VOA慢速英语:磁极的移动速度比科学家预想的快

pole – n. either end of the imaginary line around which something, such as the earth, turns

compass – n. a device that is used to find direction by means of a needle that always points north

location – n. a place or position

navigation – n. the act, activity, or process of finding the way to get to a place when you are traveling in a ship, airplane or car

region – n. a part of a country or of the world that is different or separate from other parts in some way

prone – adj. likely to do, have, or suffer from something

accelerate(d) – v. to gain speed

core – n. the central part of something

reverse – v. to change something to an opposite state or condition