It's says find the mid-point and split the list in half. Copy of the back end, sorry, copy of the left side, copy of the right side.

找到列表的中间节点，然后在这里将列表分解成两半，后端的拷贝，左部分的拷贝，右部分的拷贝。

youdao

Jack is an electric duck, his back filled with a switch, turn left three times, turn right around and a half, he will Midon two feet, walking patter.

杰克是一只电动鸭，他的背上装著一个开关，向左转三圈，再向右转一圈半，他就会迈动两只脚，啪嗒啪嗒走起路来。

youdao

Jack is an electric duck, his back filled with a switch, turn left three times, turn right around and a half, he will Midon two feet, walking patter.

杰克是一只电动鸭，他的背上装著一个开关，向左转三圈，再向右转一圈半，他就会迈动两只脚，啪嗒啪嗒走起路来。

youdao