The phrase "work on" means to put effort into improving or completing something. It is commonly used to describe actions related to skills, projects, or problems. For example, if someone says, "I need to work on my writing skills," it means they are trying to improve their writing. Similarly, "She is working on a new project," suggests she is actively developing or completing it. The phrase can also refer to fixing issues, such as "We need to work on our communication," meaning effort is needed to improve how people interact.

“work on” 這個片語通常是指「致力於…、修煉／改進…」或「努力說服某人」，語氣很靈活，可以接具體的任務、技能，也可以接人。舉例來說，I’m working on my pronunciation. 表示我正在加強我的發音；The engineers are working on a new app. 指的是工程師們正投入開發新應用程式；若想表達勸說別人，也可以說 She’s working on her dad to let her study abroad.，意思是她正努力說服爸爸讓她出國念書。只要記得 “work” 後面加介系詞 “on”，就能自然地描述自己花心思改善或推進某件事喔！

Back up is a phrasal verb with several meanings. It can mean to support someone or something, like when you help a friend or provide evidence for a claim. It can also mean to move in reverse, like when driving a car. "Back up" can also refer to making a copy of data, such as saving files to a computer or cloud. Lastly, it can mean to provide additional space or resources, such as having extra people or supplies when needed.

當你聽到「back up」這個片語時，記得先看看上下文，因為它最常見的三種意思差異不小：第一，表示「往後退」或「倒車」，例如："Could you back up a little so I can open the drawer?"；第二，表示「支持、聲援某人」，如："Don't worry, I'll back you up if anyone complains."；第三，指「備份檔案或資料」，例如："Make sure you back up your files before updating the software." 掌握這三個用法，就能在日常對話、工作場合或電腦操作時靈活運用「back up」！

"Out of order" means that something is not working properly or is broken. It is often used to describe machines, equipment, or systems that are not functioning as they should. For example, if an elevator is not working, you might see a sign that says "Out of order." It can also be used to describe something that is not in the correct sequence or arrangement.

當你看到 "out of order" 這個片語時，它通常用來表示某個設備或系統「故障、無法運作」的意思，好比說你走到自動販賣機前面，螢幕上貼著一張紙寫著 “The vending machine is out of order.”，就代表這台販賣機壞掉了，目前不能用。除此之外，在較正式或比喻的語境中，它也可以形容行為或言論「不合規範、不適當」，例如在會議中有人突然大聲插話，你可能會聽到主持人說 “Your comment is out of order.”，意指對方的發言不符合程序或禮貌。總之，看到 “out of order” 時，腦中先浮現「這個東西（或行為）不能正常運作、不合規矩」就很容易理解啦！