1
5 [verb] [complement]
5 is my lucky number.
5是我的幸运数字。
五
先理解核心含义，再看它在真实句子里的用法。
五
the cardinal number 5; one more than four
5 is my lucky number.
5是我的幸运数字。
DNA链末端带有磷酸基团的一端
That end of any DNA strand that has a terminal phosphate group.
数字五
the cardinal number that is the sum of four and one
There are 5 students in the group.
小组里有5名学生。
Please turn to page 5 in your textbook.
请翻到课本的第5页。
She chose option 5 on the form.
她在表格上选了选项5。
5 is my lucky number.
5是我的幸运数字。
表示具体的数字5。
The number 5 appears often in this sequence.
数字5在这个序列中经常出现。
表示数量。
5 of the students passed the exam.
学生中的5个通过了考试。
Not this
Number 5 is lucky.
Use this
The number 5 is lucky.
中文没有冠词，所以学习者容易在 'number 5' 前遗漏定冠词 'the'，但英语中特指某个数字时需要加 'the'。
Not this
5 is my favorite number.
Use this
Five is my favorite number.
英语中，句首的数字通常要拼写为单词，不能直接使用阿拉伯数字。
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Dictionary facts from ECDICT, WIKTIONARY.