谜语一个：To move one's hand from side to side,usually to say "hello" or "goodbye"
问题描述：
谜语一个：To move one's hand from side to side,usually to say "hello" or "goodbye"
What's this?The world is__________(英文哦~）
答
wave
释义：to raise your arm and move your hand from side to side in order to make someone notice you
wave (somebody) goodbye ：(=say goodbye to someone by waving to them) The nurses came out to wave Grandad goodbye.
摘自朗文英语词典.