"Happy Children's Day!" is a common Engpsh greeting for Children's Day, which is celebrated on June 1st.
The origin of Children's Day can be traced back to the 1920s, when it was first estabpshed by the World Conference for the Well-being of Children in Geneva, Switzerland. The conference aimed to improve children's rights and wellbeing, and June 1st was chosen as Children's Day to commemorate the day.
Here are some Engpsh examples with Chinese translations:
"Wishing all the kids a Happy Children's Day!"
祝所有的孩子六一儿童节快乐！
"Let's celebrate the joys of childhood on this Children's Day!"
让我们在这个儿童节庆祝童年的快乐！
"Happy Children's Day to all the pttle ones out there!"
给所有的小孩六一儿童节快乐！