背景材料
2019年1月3日上午10点26分，“嫦娥四号”探测器成功着陆在月球背面东经177.6度、南纬45.5度附近的预选着陆区，并通过“鹊桥”中继星传回了世界第一张近距离拍摄的月背影像图，揭开了古老月背的神秘面纱。此次任务实现了人类探测器首次月背软着陆，首次月背与地球的中继通信，开启了人类月球探测新篇章。
图片来源网络
For the first time in history, a space mission has touched down on the far side of the moon.China’s Chang’e-4 probe landed in the oldest and deepest basin on the moon’s surface, making the mission a milestone for both China and space exploration as a whole.This isn’t the first time China has landed on the moon.
mission n.使命，任务
probe v. 调查，探寻；n.探测器
basin n.盆地，盆
milestone n.里程碑，重大事件，转折点
In 2013 Chang’e-3 successfully touched down on Mare Imbrium, a huge lava plain on the moon’s surface. But until now, China has never explored the moon’s mysterious dark side.No one has.That’s actually why it’s called the dark side.
Mare Imbrium 雨海
lava n.熔岩，岩浆，火山岩
plain adj.朴素，简单 n.平地，平原
mysterious adj. 神秘的
It’s not hidden from the sun, it’s hidden from our view.That’s because the moon is in what’s called synchronous rotation with the Earth, which means every time the moon rotates once on its axis, it also completes one orbit around the Earth.As a result, we see the same face of the moon every night.
synchronous adj.同时的，同步的
rotation n.旋转；轮流，交替
axis n.轴；坐标轴
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