VOA慢速英语:Stephen Hawking Calls for Return to Moon

resource - n. something that a country has and can use to increase its wealth​

beyond - adv. on or to the farther part or side​

convince - v. to cause (someone) to believe that something is true​

boldly - adv. not afraid of danger

challenge - v. to question the action or authority of someone or something

elevate - v. to lift up

leap - v. to move forward quickly or by a lot​-

rekindle - v. to cause something, like a feeling, to be strong or active again