科学-天文
it's midday.
现在是正午。
How do you know that ?
你怎么知道的呢？
Because the sun is in the sky.
因为天上有太阳。
The sun gives us light and heat.
太阳带给我们光和热
Without the sun, no living things could live.
如果没有太阳，所有的生命都不能存活。
It's dark at night. What do you see in the sky?
晚上很暗，你在天空上看到什么？
We can see the moon in the night sky.
我们在夜空上看到月亮
Let's see how the moon changes its shape.
我们看看月亮怎样变化模样。
There are a full moon, a half moon, and a crescent moon.
有滿月、半月和新月。
What else can we see in the night sky?
我们在夜空上还能看到什么？
We can see lots of stars.
我们能看到很多星星。
Why don't we try finding the Big Dipper ?
来找找北斗七星吧？