A week is a period of seven days. Some people consider that a week starts on Monday and ends on Sunday.
双语例句
例：
I had a letter from my mother last week.
我上星期收到了母亲的一封信。
例：
This has been on my mind all week.
我整个星期都在想这件事。
2.?[C 可数名词] 一周时间
A week is a period of about seven days.
双语例句
例：
Her mother stayed for another two weeks.
她母亲又呆了两周时间。
例：
Only 12 weeks ago he underwent major heart transplant surgery.
12个星期前他才刚刚接受了风险很高的心脏移植手术。
3.?[C 可数名词] 工作周（指一周的工作时数）
Your working week is the hours that you spend at work during a week.
双语例句
例：
It is not unusual for women to work a 40-hour week.
女性一周工作40小时的情况并不少见。
4.?[SING 单数型名词] （除星期六和星期日以外的）周工作日
The week is the part of the week that does not include Saturday and Sunday.
双语例句
例：
the hard work of looking after the children during the week.
除周末外每天都照看孩子的辛苦活。
5.?[C 可数名词] 用于a week last Monday, a week ago this Tuesday, 以及a week ago yesterday等词组中，表示前一星期的该日
You use week in expressions such as 'a week last Monday', 'a week ago this Tuesday', and 'a week ago yesterday' to mean exactly one week before the day that you mention.
双语例句
例：
'That's the time you weren't well, wasn't it?'—'Yes, that's right, that was a week ago last Monday.'