平日的英文：
an ordinary day

参考例句：

"It opens at 8 am on weekdays, But at 9 at weekends."
平日上午8点开,但周末9点开

A weekday which is a public holiday when the bank is closed.
公共假日碰上的平日的那一天，在这一天银行停业。

The two boys were sworn friends all the weekdays, and embattled enemies on Saturdays
这两个朋友平日是莫逆之交，一到星期六就是对阵的敌人。

Does the shop open at 9 am on weekdays?
这家店平日是早上9点开门吗?

The two of us have nothing to do anyways, so we just get our grandson here and look after him on weekdays.
老俩儿闲着也是闲着，平日里把孙子接过来照看。

The sound of guns violated the usual calm of Sunday morning.
炮声扰乱了平日星期日早晨的安静。

The two boys were sworn friends all the weekdays, and embattled enemies on Saturdays.
这两个朋友平日是莫逆之交，一到星期六就是对阵的敌人。

Several more people than usual came to the lunchtime concert.
来参加午餐时间音乐会的人比平日多了几个.

He was an honest, sober, and efficient member, and nothing particular could be alleged against him
他是个忠实、严肃而得力的信徒，而且平日为人无懈可击。

Thanks to abstemious habits, he had not grown fat and flabby
多亏了平日饮食有节，这张脸并没有变得痴肥。

ordinary是什么意思：
adj.普通的，平庸的

An ordinary mediocre material
中等人材

This word is seldom used on ordinary occasions.
这个词儿平常很少用。

The rules will suffice for all ordinary needs.
这些规定将能满足所有一般场合的需要。

Smith was admitted into this club as an ordinary member.
史密斯被接纳为这俱乐部的普通员。

The terrorists indiscriminate murder of ordinary people.
恐怖主义者不分青红皂白地杀害普通百姓。

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。

It was a fateful day.
那是个不祥的日子。

Meantime, from day to day they endure.
同时，一天天他们捱了下去。