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ADJ
獨自的
When you are alone, you are not with any other people.
例句
There is nothing so fearful as to be alone in a combat situation...
沒有比孤身奮戰更可怕的了。
He was all alone in the middle of the hall.
他獨自一人在大廳中間。
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ADJ
單獨的（無其他人在場的）
If one person is alone with another person, or if two or more people are alone, they are together, without anyone else present.
例句
I couldn't imagine why he would want to be alone with me...
我想象不出為什么他會想和我獨處。
My brother and I were alone with Vincent.
我和弟弟與文森特單獨呆著。
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ADJ-GRADED
孤苦伶仃的;無依無靠的；孤單的
If you say that you are alone or feel alone, you mean that nobody who is with you, or nobody at all, cares about you.
例句
Never in her life had she felt so alone, so abandoned...
她一生中從來沒有感到如此孤單，如此無助。
He found himself alone in a hostile world.
他感到自己處在一個充滿敵意的環境中，孤立無援。
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ADV
僅僅;只
You say that one person or thing alone does something when you are emphasizing that only one person or thing is involved.
例句
You alone should determine what is right for you...
只有你自己才能決定什么適合你。
They were convicted on forensic evidence alone.
僅憑著法醫證據，他們就被判有罪。
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ADV
單單（強調部分或整體的數量）
If you say that one person or thing alone is responsible for part of an amount, you are emphasizing the size of that part and the size of the total amount.
例句
The BBC alone is sending 300 technicians, directors and commentators...
單單英國廣播公司就派出技術人員、導演、解說員等一行300人。
Megastars like Jack Nicholson, who made $500 million from Batman alone, are unlikely to be affected.
像杰克·尼科爾森這樣的巨星，單從《蝙蝠俠》一部片子中就賺了5億美元，是不太可能受影響的。
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ADJ
唯一的
If someone is alone in doing something, they are the only person doing it, and so are different from other people.
例句
Newcastle is far from alone. Colleges around the country have developed programmes of student support...
遠不止是紐卡斯爾，全國的許多大學都推出了助學項目。
Am I alone in thinking that this scandal should finish his career?
只有我認為這件丑聞會斷送他的事業嗎？
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ADV
獨力;單獨
When someone does something alone, they do it without help from other people.
例句
Bringing up a child alone should give you a sense of achievement...
自己一個人帶大孩子會給你一種成就感。
He was working alone and did not have an accomplice.
他在單干，沒有同伙。
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PHRASE
單獨行動;獨自干
If you go it alone, you do something without any help from other people.
例句
I missed the stimulation of working with others when I tried to go it alone.
當我試圖單干時，我很懷念與他人一起工作的那股興奮勁。