介绍:
上一期答案
A device that weighs less than one kilogram is part of a mission that will allow scientists to deliver fourth generation or 4G mobile coverage to the moon in 2019.
词汇表
1.deliver 履行诺言；不负所望；兑现
2.coverage 覆盖范围
把你听到的写到评论区，我会一一回复哒～
