该句使用it is true that引出观点，并通过once连接时间关系，表达深刻的人生感悟。
A mole burrowing underground needs no vision, only touch and smell; similarly, those who only follow "hidden rules" lack ideals and faith, seeking only profit and immediate gain.
Never stop smiling. Even in your most difficult moments, your smile might just win someone's heart.
It is true that we only realize what we had once it is lost; yet, do we notice that by the time something arrives, we may have already missed our chance?
Experience is the whetstone of life, allowing our brilliance to shine through friction; experience is the ore of life, releasing our vitality through refinement.
We may lose at the starting line of life, but we must never lose at its turning points.
The art of wisdom lies in knowing, with clarity, what to ignore.
鼹鼠在地下挖掘时，不需要视力，仅凭触觉和嗅觉即可；而那些只顾钻营“潜规则”的人，又怎会有理想和信仰，只会贪图功利与实惠。
永远不要停止微笑。即便在失落时刻，你的微笑也可能让某人动容。
人们常在失去后才意识到曾经拥有的珍贵；却往往忽略了，当机遇降临之时，我们或许已错失良机。
经历是人生的磨刀石，让生命的锋芒在磨砺中闪光；经历是人生的矿石，让生命的活力在提炼中释放。
我们或许会输在人生的起跑线上，但绝不能输在人生的转折点。
智慧的艺术，在于清醒地懂得如何选择忽略。
"Cherish what you have today, and you will be wealthy tomorrow."
"Do not easily abandon what belongs to you, lest you leave behind regrets and remorse."
"People often cherish what they have not obtained."
"We only realize the value of what we have once it is lost."
"The most precious things are often not by our side."