97.turn v. 转身，变成，n.（轮流的）顺序

97.turn v. 转身，变成，n.（轮流的）顺序
I heard a loud noise then I turned around and found a bear behind me.
In autumn， the leaves of the trees turn gold and then brown, so it's very beautiful.
It is one's turn to do something，轮到某人做某事
It's your turn to clean the classroom，Betty.