Author: QIU Juntao.
The second week homework for Episode 3.
Author: XING YanMing.
Author: LOU Jia.
Author: ZHENG Fang.
Author: ZHANG Jingqiang.
Author: LIU Lin.
Author: MENG FanChao.
Author: MA RuiLu.
Author: CAI Tong.
Author: TIAN Jia.
Author: GAO Yan.
Author: SI Xiaojing.
Author: Wang Qianlei.
Author: SHANG Fei.
Author: JIA Wei.
Author: BIAN Rui & YANG ShaoBo.
Author: QI Lei.
Author: WU Jie & QIN LianJie.
Author: YANG Jing.