七天的用法和樣例：
例句
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安息日猶太教徒和一些基督教派認為星期六－一周的第七天為休息和拜神的日子即安息日
The seventh day of the week, Saturday, observed as the day of rest and worship by the Jews and some Christian sects. -
一星期由七天組成。
A week consist of seven days. -
一周有七天。
There are seven days in a week. -
一星期有幾天？一星期有七天。
How many days are there in a week? There are seven days in a week.
