使用了must not否定语气，并包含两个并列的动词短语。
Whether students in school or young people just entering society, we are all just at the starting point of life's journey. To work effectively or achieve success, continuous humble learning and persistent effort are still required.
Success is not achieved overnight. Although a superior family background, excellent schools, teachers, and abundant learning resources can provide everything, it is difficult to become a great leader without perseverance and determination.
Without falling, one cannot know the hardships of the journey; without failure, one cannot experience the bitterness of pain; a life lacking ups and downs is incomplete.
Although everyone hopes for luck, peace, and smoothness in all things, this is merely a wish. Therefore, we should maintain a clear mind during peaceful times and always be mindful of potential difficulties, setbacks, or even blows that may follow, in order to prevent future misfortunes.
In battle, if our army wins and the enemy is defeated, we must not become arrogant or lazy. Instead, we should remain highly vigilant to prevent the enemy's counterattack. By staying prepared, we will not be in danger even if the enemy dares to attack. We must not become complacent or let our guard down.
无论是学生还是初入社会的青年，都只是人生的起点。若想游刃有余地工作或取得成就，仍需长期的虚心学习与不懈努力。
成才并非一蹴而就。即便拥有优越的家庭背景、优质的教育资源和丰富的学习材料，若缺乏恒心与毅力，也很难成就一番事业。
没有经历过跌倒，便无法体会前行的艰辛；没有经历过失败，便无法领悟痛苦的滋味；缺乏挫折的人生或许平顺，却并不完美。
虽然人们总期盼事事顺利、万事如意，但这仅是美好的愿景。我们应当在平顺之时保持清醒，时刻预见到困难、挫折甚至打击的可能，从而做好应对未来的准备。
就像在战斗中，取得胜利后绝不能骄傲懈怠，而应时刻严加戒备，防范敌人的反扑。只有做好充分准备，才不会在危机来临时陷入险境。切记不可狂妄自大，不可高枕无忧。