1
the number [num]
这里'7'作为名词，指数字本身。
The number 7 is considered lucky in many cultures.
数字7在许多文化中被认为是幸运的。
七
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七
seven
The number 7 is considered lucky in many cultures.
数字7在许多文化中被认为是幸运的。
六加一的基数
the cardinal number that is the sum of six and one
My lucky number is 7, so I always choose it in contests.
我的幸运数字是7，所以我在比赛中总是选它。
If you add three and four, the result is 7.
如果你把三和四加起来，结果是7。
She was excited when she saw 7 on the lottery ticket.
她看到彩票上的7时很兴奋。
这里'7'作为名词，指数字本身。
The number 7 is considered lucky in many cultures.
数字7在许多文化中被认为是幸运的。
7 is a prime number.
7是一个质数。
当7表示时间点时，用作名词，指七点钟。
The movie starts at 7.
电影在7点开始。
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Dictionary facts from ECDICT, WIKTIONARY.