VOA慢速英语:California Study Finds Moon is 4.51 Billion Years Old

短语讲解：

1. For almost as long as people have walked on Earth, they have looked up at the moon and wondered: How did the moon get there?

as long as 只要; 如果; 既然
例句：As long as I breathe, I will fight them.
只要一息尚存，我就要跟他们斗。

2. And we found out that the moon is actually older.

find out 发现; 使发作; 使受惩罚
例句：You can find out whether they are prepared to share the cost of the flowers with you
你可以弄清楚他们是否愿意和你一起分担买花的费用。

3. you have much more time to cool down your Earth to like start having your plate tectonics things again, generate the atmosphere, generate the water and then finally having all the conditions met for life.

cool down 降温; 冷静下来
例句：He has had time to cool down and look at what happened more objectively
他已经冷静了一段时间，能更加客观地看待所发生的事情。

4. He hopes NASA will be able to send a probe to the crater to find out why that side is so different.

find out 发现; 使发作
例句：You can find out whether they are prepared to share the cost of the flowers with you
你可以弄清楚他们是否愿意和你一起分担买花的费用。