嘿，这是一年一次的节日！

Hey, it's a once a year celebration!

youdao

嘿，这是一年一次的节日！

Hey, it's a once a year celebration!

youdao

地球日是一年一次号召人们一起来为拯救地球而努力的节日。

Earth Day is a yearly call for people to work together to save the planet.

youdao

地球日是一年一次号召人们一起来为拯救地球而努力的节日。

Earth Day is a yearly call for people to work together to save the planet.

youdao