feat: add scripts for fetching and training educational corpus

- Implemented `fetch_corpus.py` to scrape Chinese educational content from Wikipedia, covering subjects like Chinese, Math, English, Chemistry, Politics, History, Geography, Physics, and Biology.
- Developed `fetch_corpus_incremental.py` for incremental fetching of missing entries, with automatic retries for rate limiting and support for resuming interrupted downloads.
- Created `train_chat.py` for training a dialogue model, including corpus cleaning, vocabulary management, and staged training with adaptive learning rates.
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# 幼儿园小班英语启蒙课程3-4 岁)
## 一、课程目标
1. 对英语儿歌和简单指令感兴趣。
2. 能听懂并做出简单动作指令TPR
3. 愿意模仿简单的英语单词和短句。
## 二、核心知识点
- 常见动物cat 猫、dog 狗、bird 鸟、fish 鱼、rabbit 兔子、bear 熊。
- 常见颜色red 红色、yellow 黄色、blue 蓝色、green 绿色。
- 数字 1-5one、two、three、four、five。
- 家庭成员mum 妈妈、dad 爸爸、grandma 奶奶、grandpa 爷爷。
- 日常用语Hello 你好、Bye-bye 再见、Thank you 谢谢、Yes 是、No 不是。
- 动作指令clap 拍手、wave 挥手、jump 跳、walk 走、run 跑、touch 触摸。
## 三、具体活动教案
### 活动 1Hello 歌
**目标**:学会用 Hello 打招呼。
**歌曲**
> Hello, hello, hello, how are you?
> I'm fine, I'm fine, I'm fine, thank you.
**过程**:围成圈,边唱边挥手打招呼。
### 活动 2动物模仿秀
**目标**:听懂动物英文名称,能模仿动物动作和叫声。
**准备**:动物图片或手偶。
**过程**
1. 出示动物图片,教读单词。
2. 教师说单词,幼儿模仿动物。
3. 游戏What's this? It's a cat/dog/bird.
### 活动 3颜色找找看
**目标**:认识常见颜色英文。
**准备**:颜色卡片。
**过程**
1. 出示颜色卡片,教读 red/yellow/blue/green。
2. 游戏Find something red. 幼儿找出红色物品。
3. 用英语描述The apple is red.
### 活动 4One Little Finger
**目标**:认识身体部位英文,能跟随指令做动作。
**歌曲**
> One little finger, one little finger, tap tap tap.
> Point your finger up. Point your finger down.
> Put it on your head. Head!
> Put it on your nose. Nose!
### 活动 5数字歌
**目标**:认识数字 1-5 英文。
**歌曲**
> One, two, three, four, five, once I caught a fish alive.
> Six, seven, eight, nine, ten, then I let it go again.
## 四、生活情景文本
### 情景 1看电视时
> 电视里播放英文动画片小猫说“Hello, I'm Cat.”
> 小明跟着说“Hello, Cat!”
> 妈妈问“What animal is it?”
> 小明说“It's a cat.”
> 妈妈说“Yes, the cat is white.”
### 情景 2放学路上
> 小红看到一只小狗。
> 小红说“妈妈dog小狗
> 妈妈说“Yes, it's a dog. What color is it?”
> 小红说“Yellow.”
> 妈妈说“Good, it's a yellow dog.”
### 情景 3同学对话
> 小刚和小丽在英语角玩卡片。
> 小丽拿起一张红色苹果卡片说“Apple, red.”
> 小刚拿起香蕉卡片说“Banana, yellow.”
> 小丽说“I like apple.”
> 小刚说“I like banana.”
### 情景 4在家里
> 爸爸下班回到家。
> 小美跑过去说“Hello, dad!”
> 爸爸说“Hello, my dear. How are you?”
> 小美说“I'm fine, thank you.”
> 爸爸说“Give me five!”
### 情景 5在公园里
> 小强和妈妈看到湖里有鸭子。
> 妈妈说“Look, what are they?”
> 小强说“Ducks!”
> 妈妈说“How many ducks?”
> 小强数了数“One, two, three, three ducks.”
> 妈妈说“Great!”
## 五、训练文本
- 日常对话:
- A: Hello! B: Hello!
- A: What's your name? B: My name is Tom.
- A: How are you? B: I'm fine, thank you.
- TPR 指令:
- Clap your hands. Stamp your feet.
- Touch your nose. Wave your arms.
- Jump up and down. Turn around.
- 动物单词问答:
- What animal says meow? A cat says meow.
- What animal says woof? A dog says woof.
## 六、家园共育
- 每天播放 5-10 分钟英文儿歌,不强求跟读。
- 在日常生活中渗透英语,如点名、数数、打招呼。