学校为地球日组织了一项活动。

The school organized an activity for Earth Day.

他们种植了一棵树来庆祝地球日。

They planted a tree to celebrate Earth Day.

今年是地球日50周年。

This year marks Earth Day's 50th birthday.

明天是地球日。让我们讨论一下，我们应该什么时候发传单。

Tomorrow is Earth Day. Let's discuss when shall we give out the leaflets.

世界地球日不也是这天吗？

Isn't World Earth Day also celebrated then?

为此，祝大家“地球日”快乐。

So Happy Earth Day.

在地球日单车上路真高兴看到你.

It was great to see you at the Earth Day bicycle event!

一年之后诞生了首个世界地球日。

The inaugural Earth Day happened a year later.

你知道庆祝地球日的最佳方式吗？

You know what the best way to celebrate Earth Day is?

地球日是一个赞颂生命与地球的节日.

Earth Day is a celebration of life and our planet.