嘿，这是一年一次的节日！
嘿，这是一年一次的节日！
儿童节是我们最喜欢的节日了，每一年都会举行一次联欢会，去年的联欢会最有趣。
Children's Day is our favorite festival. Each year we will hold a party. The most interesting party last year.
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.
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.
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