VOA慢速英语:美国航天局准备对月球水的探测任务

mission – n.an important task, usually involving travel

debris – n.broken pieces of something

rush–n. a situation in which someone is doing something very quickly or hurrying

figure – n.decide something after thinking about it

drill – v.make holes in hard materials with a machine

commercial – adj.relating to the buying and selling of things