Requirements for words 用词要求
    accurate, concise, concrete; avoid vague, outdated jargon and wordy expressions.

    准确、简洁、具体；避免模糊表达、过时行话、冗长语句。

    Tone types 语气类型

    Positive tone：highlight solutions, constructive, avoid blame.
    积极语气：强调解决方案，重在建设，不指责。
    Negative tone：focus on bad news /blame; soften tone when bad news has to be given (explain reasons first + gentle statement + solutions).
    消极语气：侧重坏消息、指责；迫不得已告知坏消息时要缓和语气：先解释原因、委婉表述、给出方案。

    You‑attitude vs we‑attitude

    you‑attitude: think from reader’s side; respect reader’s needs and feelings.
    读者本位：站在读者角度，尊重对方需求感受。
    we‑attitude: focus on our own interests; sound self‑centered.
    我方本位：只关注己方利益，显得自我。

    General principle：proper words + professional positive tone + you‑attitude.
    总原则：恰当用词 + 专业积极语气 + 读者本位。