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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# 幼儿园中班英语启蒙课程4-5 岁)
## 一、课程目标
1. 能听懂日常生活中简单的英语指令。
2. 愿意用英语进行简单自我介绍和日常问候。
3. 对英语儿歌、故事感兴趣,能跟唱、跟读。
## 二、核心知识点
- 动物cat 猫、dog 狗、bird 鸟、fish 鱼、rabbit 兔子、duck 鸭子、monkey 猴子。
- 颜色red 红、yellow 黄、blue 蓝、green 绿、orange 橙、purple 紫。
- 数字 1-10one、two、three、four、five、six、seven、eight、nine、ten。
- 水果apple 苹果、banana 香蕉、orange 橙子、pear 梨、grape 葡萄。
- 身体部位head 头、shoulders 肩膀、knees 膝盖、toes 脚趾、eyes 眼睛、ears 耳朵、nose 鼻子、mouth 嘴巴。
- 日常对话Hello/Hi、Goodbye、What's your name? How are you? I'm fine. Thank you. You're welcome.
- TPR 指令Stand up、Sit down、Turn around、Touch your nose、Clap your hands、Stamp your feet。
## 三、具体活动教案
### 活动 1自我介绍
**目标**:能用简单英语介绍自己。
**对话**
> A: Hello, what's your name?
> B: My name is Lucy.
> A: How are you?
> B: I'm fine, thank you. And you?
> A: I'm fine, too.
### 活动 2水果店
**目标**:认识常见水果英文。
**词汇**apple、banana、orange、pear、grape。
**对话**
> A: What do you like?
> B: I like apples.
> A: Here you are.
> B: Thank you.
### 活动 3身体部位歌
**目标**:认识身体部位英文。
**歌曲 Head, Shoulders, Knees and Toes**
> Head, shoulders, knees and toes, knees and toes.
> Head, shoulders, knees and toes, knees and toes.
> And eyes and ears and mouth and nose.
> Head, shoulders, knees and toes, knees and toes.
### 活动 4颜色找找看
**目标**:能用英语描述物品颜色。
**过程**
1. 教师说Find something red.
2. 幼儿找出红色物品并说出The ... is red.
3. 依次练习其他颜色。
### 活动 5数字接龙
**目标**:巩固 1-10 英文数字。
**过程**
1. 幼儿围成圈,依次说 one、two、three...
2. 加快语速,看能否接龙成功。
3. 倒数 ten 到 one。
## 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. I like fish.”
> 小明跟着说“Hello, Cat. I like fish, too.”
> 妈妈问“What color is the cat?”
> 小明说“It's white.”
> 妈妈说“Yes, it's a white cat.”
### 情景 2放学路上
> 小红看到一只黄色的蝴蝶。
> 小红说“妈妈look, a butterfly!”
> 妈妈说“Yes, it's a butterfly. What color is it?”
> 小红说“It's yellow.”
> 妈妈说“Good job. Do you like butterflies?”
> 小红说“Yes, I do.”
### 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.”
> 小丽说“Yummy!”
### 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!”
> 小美说“Yeah!”
### 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! What color are they?”
> 小强说“They are yellow and white.”
## 五、训练文本
- 动物问答:
- What animal is it? It's a cat.
- What animal can fly? A bird can fly.
- What animal likes bananas? A monkey likes bananas.
- 颜色描述:
- The sky is blue.
- The apple is red.
- The banana is yellow.
- 日常指令:
- Stand up, please. Sit down, please.
- Open your book. Close your book.
- Listen carefully. Look at me.
## 六、家园共育
- 每天固定 10 分钟英语儿歌或动画时间。
- 在日常生活中渗透英语,如点名、数数、打招呼。