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ADJ
独自的
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...
没有比孤身奋战更可怕的了。
He was all alone in the middle of the hall.
他独自一人在大厅中间。
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ADJ
单独的（无其他人在场的）
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...
我想象不出为什么他会想和我独处。
My brother and I were alone with Vincent.
我和弟弟与文森特单独呆着。
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ADJ-GRADED
孤苦伶仃的;无依无靠的；孤单的
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...
她一生中从来没有感到如此孤单，如此无助。
He found himself alone in a hostile world.
他感到自己处在一个充满敌意的环境中，孤立无援。
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ADV
仅仅;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...
只有你自己才能决定什么适合你。
They were convicted on forensic evidence alone.
仅凭着法医证据，他们就被判有罪。
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ADV
单单（强调部分或整体的数量）
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...
单单英国广播公司就派出技术人员、导演、解说员等一行300人。
Megastars like Jack Nicholson, who made $500 million from Batman alone, are unlikely to be affected.
像杰克·尼科尔森这样的巨星，单从《蝙蝠侠》一部片子中就赚了5亿美元，是不太可能受影响的。
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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...
远不止是纽卡斯尔，全国的许多大学都推出了助学项目。
Am I alone in thinking that this scandal should finish his career?
只有我认为这件丑闻会断送他的事业吗？
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ADV
独力;单独
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...
自己一个人带大孩子会给你一种成就感。
He was working alone and did not have an accomplice.
他在单干，没有同伙。
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PHRASE
单独行动;独自干
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.
当我试图单干时，我很怀念与他人一起工作的那股兴奋劲。