week/wiːk/

1.noun [c] 
星期

I had a letter from my mother last week.
上星期我收到一封我母亲的信。
2.noun

(working week) 工作周

workers on a three-day week
实行3天制工作周的工人
3.noun

the week (Monday to Friday) 工作日

this/next/last week
本/下/上周
once/twice a week
一周一次/两次
in two weeks' time
在两周后
a week today/on Friday
下星期的今天/下星期五
during the week
在工作日期间