单词 word
短语 phrase
句子 sentence
这三个词都是英语的基本词汇，用于描述语言组成的基本单元。
单词是由一组有意义的字母组成的最小语言单位，如 "dog"、"cat"、"house"。
短语是由一组单词组成的语言单位，如 "big house"、"nice dog"。
句子是一组词语组成的语言单位，表达一个完整的思想或意思，如 "The dog is big."、"I have a nice house."
下面是一些例句:
The cat sat on the mat. (猫坐在垫子上。)
I have a big house. (我有一个大房子。)
She is eating an apple. (她在吃苹果。)
He has a nice car. (他有一辆好车。)
The dog is playing with the ball. (狗在玩球。)
这些词汇来源于古英语，word 来自古英语 "word"，phrase 来自古希腊语 "phras"，sentence 来自拉丁语 "sententia"