“Maintain” typically refers to the act of keeping something in a particular state or condition, often through regular efforts or actions. It can imply preserving, supporting, or caring for something over time.
“Maintain” 通常指的是透過定期的努力或行動，將某物保持在特定的狀態或條件中。它可以暗示隨著時間的推移保護、支持或照顧某物。
Example:
It's important to maintain a healthy lifestyle by exercising regularly and eating well.
通過定期鍛煉和良好飲食習慣保持健康的生活方式是很重要的。
“uphold” typically refers to the act of supporting or defending a principle, belief, or value, often in the face of opposition or challenge. It can imply ensuring that something is upheld or sustained, often in a moral or ethical sense.
“Uphold” 則通常指的是在面對反對或挑戰時支持或捍衛一個原則、信念或價值觀。它可以暗示確保某事物被堅持或維護，通常是在道德或倫理意義上。
Example:
As a judge, it's his duty to uphold the principles of justice and fairness in every decision he makes.
作為一名法官，他的責任是在每一個判決中堅持公正和公平的原則。