The first lesson I learnt as a soldier was never to underestimate the enemy.作为一名士兵，我学到的第一课就是决不要低估敌人。The first lesson I learnt as a soldier was never to underestimate the enemy.身为一名士兵，我学到的第一课就是决不要轻视敌人。Having read lesson one, I went on to read lesson two.我读完第一课后，进而读第二课。