When the sun goes down, the stars come out.

太阳落山时，星星就出来了。

youdao

When the sun goes down, the partying begins.

当太阳下山时，聚会开始了。

youdao

When the sun goes down, we can see the stars.

当太阳落下，我们能看见星星。

youdao

Every evening, as the sun goes down, thousands of adult bats fly out of the natural entrance of the cave.

VOA: special.2009.12.07

It was like justbefore the sun goes to bed down on the bayou.

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When the sun goes down, the hydrogen powers a fuel cell that runs your home.

FORBES: Cheap Hydrogen From Dirty Water...Maybe

As the sun goes down, the crew dons night-vision goggles, scanning for muzzle flashes or smoke trails.

NPR: Adrenaline Flows When Medevac Unit Takes Flight

Today, when the sun goes down in Africa, over 150 million homes will not turn on the lights.

FORBES: How to Light Africa Within a Decade