如果是非正式的
Hi everybody,nice to see you here, my name is ***, I'm ** years old. Now I'm in Class** Grade**. Hope you can enjoy your stay here.
要是正式的
Hello, everyone. I'm very glad you are here, first, please allow me to introduce myself.My name is ***.I'm ** years old. Now I'm studying in Class**, Grade**,***primary School.
剩下的就自己说吧
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