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CONVENTION
哈罗;你好
You say 'Hello' to someone when you meet them.
例句
Hello, Trish...
你好，特里茜。
Do you want to pop your head in and say hallo to my girlfriend?
你要不要进来和我女友打个招呼？
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CONVENTION
（打电话时的招呼语）喂
You say 'Hello' to someone at the beginning of a telephone conversation, either when you answer the phone or before you give your name or say why you are phoning.
例句
A moment later, Cohen picked up the phone. 'Hello?'
过了一会儿，科恩接起电话。“喂？”
Hallo, may I speak to Frank, please.
喂，我找弗兰克。
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CONVENTION
（用于引起别人注意）喂
You can call 'hello' to attract someone's attention.
例句
She could see the open door of a departmental office. 'Hello! Excuse me. This is the department of French, isn't it?'...
她看到一个系办公室的门开着。“喂！请问，这是法语系，对吗？”
Very softly, she called out: 'Hallo? Who's there?'
她轻声细气喊道：“喂？有人吗？”