使用 before we know it 这个固定搭配，生动地表达了“不知不觉”的意思。
Time flows away silently, and before we know it, we have grown up. Whenever we gather the courage to move forward, life's setbacks hit us hard. As you set sail, I can only offer silent blessings in my heart. I often tell myself, "I will work hard to become strong and protect everyone who cares for me." But the reality is, in front of them, I am always just a child. When my sister worries about her business, I desperately want to ease her burden, yet I can do nothing, unable to even offer a kind word, so I simply step aside to avoid causing trouble. When my brother struggles with finances, I long to earn enough to be self-sufficient, but I still find myself relying on my parents. When they are busy working for a living, I can only watch helplessly. When a friend is heartbroken, I remain powerless to help... I once complained about the unfairness of fate, but it changed nothing; life goes on. Perhaps I am not hard-working enough. Perhaps I am not strong enough. Perhaps... Oh, youth, what shall I use to write your story?
时光在无声中流逝，转眼间我们已渐渐长大。每当我们鼓起勇气向前迈进时，生活的变故总会猝不及防地给了我们沉重的一击。看着你们扬帆起航，我只能在心中默默送上祝福。我常对自己说：“我会努力变强，去守护每一个在乎我的人。”可现实是，在他们面前，我永远只是个孩子。当姐姐为生意忧虑时，我渴望帮她分担，却无能为力，甚至连一句安慰的话都说得笨拙，只能躲在一旁，生怕给她添乱；当哥哥为生计奔波时，我渴望能自食其力，可现实是我不仅无法赚钱，还要依赖父母；当他们为生活忙碌时，我只能在旁默默注视；当朋友陷入失恋的痛苦，我也无力宽慰……我曾埋怨命运不公，但抱怨无济于事，生活仍在继续。也许，是我还不够努力，也许，是我还不够坚强。或许，是因为……青春啊，我该拿什么去谱写你的篇章？
"Before they knew it a year had passed."
"Time waits for no one; as the years pass, hair turns to silk."
"Life is a countdown; days pass by, and the journey of life remains unpredictable."
"With every step we take, the ground beneath us falls into eternity."
"Life is like riding a train; no matter how beautiful the scenery, it always recedes."