At the beginning,everyone was in high spirits. After 10 hours,people became exhausted. They had to divide into groups and they were on duty by turns. Nevertheless,Zhang Jian was like a machine operating at full speed,swimming in the water at the time.

• 刚开始大家还兴致勃勃，10个小时后人困马乏，人们不得已分成几批轮流值班，而他却像一台拼命运 转的机器，不停地在水里游。