hello
exclamation, noun(also hullo especially in British English)
(British English also hallo)
(plural hellos, hullos, hallos)
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used as a greeting when you meet somebody, in an email, when you answer the phone or when you want to attract somebody’s attention （用于问候、接电话或引起注意）哈啰，喂，你好 Hello John, how are you? 哈啰，约翰，你好吗？ Hello, is there anybody there? 喂，那里有人吗？ Say hello to Liz for me. 替我向利兹问好。 They exchanged hellos (= said hello to each other) and forced smiles. 他们相互打个招呼，勉强笑笑。
More About greetingsgreetings 打招呼 - Hello is used in all situations, including answering the phone.
- Hi is more informal and is very common.
- Hey is used in the same way as hi, especially in American English.
- How are you? or How are you doing? (informal) often follow Hello and Hi:
How are you? 或 How are you doing?（非常口语化）常用于 Hello 和 Hi 之后： ‘Hello, Mark.’ ‘Oh, hi, Kathy! How are you?’ “马克，你好。”“噢，凯西，你好！最近好吗？”
- Good morning is often used by members of a family or people who work together when they see each other for the first time in the day. It can also be used in formal situations and on the phone. In informal speech, people may just say Morning.
- Good afternoon and Good evening are much less common. Good night is not used to greet somebody, but only to say goodbye late in the evening or when you are going to bed.
Good afternoon 和 Good evening 少用得多。Good night 只在晚上说再见或上床睡觉前说，不用以打招呼。 - If you are meeting someone for the first time, you can say Pleased to meet you or Nice to meet you (less formal). Some people use How do you do? in formal situations. The correct reply to this is How do you do?
- (British English)
第一次与人见面时可说 Pleased to meet you 或 Nice to meet you（较非正式）。在正式场合有些人用 How do you do? 正确的回答是 How do you do?。 used to show that you are surprised by something （表示惊讶）嘿 - (informal)
used to show that you think somebody has said something stupid or is not paying attention （认为别人说了蠢话或分心）喂，嘿 see also golden hello
Word Originlate 19th cent.: variant of earlier hollo; related to holla.