● Unit 1 打招呼
● Unit 2 感谢及祝贺
● Unit 3 疑问及回答
● Unit 4 情感表达
● Unit 5 托付及劝诱
● Unit 6 日常表现 k+EqJOPls1LREFP8j8Qbx75/10kw9WR0nW3pHx8x4IyXsOz5wX6hubrpZye0RVNg
