二 èr two
繁体 traditional:
听 listen: 
语法 grammar: 数词 Numeral
笔记 notes: 两 is used rather than 二 when measuring quantities. 二 is used for dates and to indicate order.
话题 topic: 数量 (Quantity)
水平 Level: 基础 Elementary (HSK 1)
例子 examples:
- èr chú bā děngyú sì
- Chǔ Wáng shǐ dàifu èr rén wǎng xiān yān, yuē, yuàn yǐ jìng nèi lèi yǐ.The king of Chu sent two second level ministers to him, with the message, “I wish to burden you with the charge of my territories.”Source: 庄子 Zhuang Zi (369-286 BCE)