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Hallo!
感叹词，用于打招呼或引起注意。
Hallo! Is anybody there?
喂！有人吗？
先理解核心含义，再看它在真实句子里的用法。
To shout, or to call with a loud voice.
Hallo! Is anybody there?
喂！有人吗？
Prepare the learner guide for this word
可生成：语法 Grammar、学习解释 Learner guide。只有点击后才会开始生成。
To shout, or to call with a loud voice.
To chase while shouting "hallo!"
To cry "hallo" (to someone).
To shout (something).
Hallo, is anyone home?
喂，有人在家吗？
Hallo, how have you been?
嘿，你最近怎么样？
Hallo, could you tell me the way to the station?
喂，能告诉我去车站怎么走吗？
感叹词，用于打招呼或引起注意。
Hallo! Is anybody there?
喂！有人吗？
名词，指喊“喂”的声音，可数名词，复数形式为 hallos/halloes。
We heard a hallo from the other side of the river.
我们听到河对岸传来一声“喂”。
动词，表示大声喊“喂”以引起注意，常与 to 连用；过去式和过去分词为 halloed。
He halloed to his friend across the street.
他隔着街朝朋友喊“喂”。
Not this
He said me hallo.
Use this
He said hallo to me.
say 的间接宾语不能直接跟在动词后；表示“对某人说”要用 say sth. to sb.，不能说 say sb. sth.。这里受汉语“对我说”的语序影响，误把 me 放在 said 后，应改为 said hallo to me。
Not this
Yesterday he hallo to me from the window.
Use this
Yesterday he halloed to me from the window.
hallo 作动词时是规则动词，过去式要加 -ed 变成 halloed；时间状语 yesterday 要求用过去时，而汉语动词没有时态变化，所以容易漏掉 -ed。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
喂，你好（打招呼）
Hallo there, I didn't see you come in.
喂，你好，我没看见你进来。
喂，[某人]（向某人打招呼）
Hallo, Maria, it's good to meet you at last.
喂，玛丽亚，终于见到你了，真高兴。
喂？（唤人或打电话时的问话）
She knocked on the door and called, "Hallo? Is anyone home?"
她敲了敲门，喊道：“喂？有人在家吗？”
喂，大家（向众人打招呼）
Hallo, everyone, thanks for coming tonight.
喂，大家好，谢谢你们今晚来。
又见面了（再次见面时打招呼）
Hallo again, we met at the conference last year.
又见面了，我们去年在会上见过。
哈啰，哈啰，哈啰！
The cheerful refrain from the 1922 music hall song 'The Laughing Policeman' is still well known in Britain: 'Hallo, hallo, hallo!'
来自1922年英国音乐厅歌曲《笑警察》的那段欢快叠句在英国依然广为人知：‘哈啰，哈啰，哈啰！’
哈啰，哈啰，你身边的那位女士是谁？
The old music hall song 'Hallo, Hallo, Who's Your Lady Friend?' was often used to tease a friend seen with a girl.
那首老式音乐厅歌曲《哈啰，哈啰，你身边的那位女士是谁？》常被用来打趣和女孩走在一起的朋友。
Use hallo naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 hello 里的 e 想成被一声响亮的“哈”盖住，写成 hallo，读作“哈罗”，都是打招呼。
语域：informal 常见场景：meeting friends、answering the phone、getting someone's attention hallo 常用于非正式场合，例如见面打招呼、接电话或引起别人注意；语气比较轻松随意。
hallo 的重音在第二个音节 /ləu/。low、slow、though、know 与它押韵，重读元音都是 /əu/。注意：hallow /ˈhæləu/ 和 hollow /ˈhɒləu/ 拼写很像，但重音在第一个音节，与 hallo 不押韵。
Dictionary facts from ECDICT, WIKTIONARY.