VOA慢速英语:嫦娥四号测量表明月球上的辐射比地球上的多200倍

exposure – n. coming in contact with something

shield – n. an object used to protect something

crater – n. a large round hole in the ground made by the explosion of a bomb or by something falling from the sky

cosmic ray – n. high-energy particles that move through space at nearly the speed of light

detector – n. a device that helps notice something that is hidden or unclear

immense – adj. extremely good

interact – v. to communicate with or react to