周三
The noun 周三 (zhōusān) means 'Wednesday' and follows the Chinese system of naming weekdays by number, where 周 means 'week' and 三 means 'three.' The alternate form 星期三 is equally common in everyday speech.
我们周三下午开会,你能来吗?
Wǒmen zhōusān xiàwǔ kāihuì, nǐ néng lái ma?
We have a meeting on Wednesday afternoon. Can you come?
周三是这个星期最忙的一天。
Zhōusān shì zhège xīngqī zuì máng de yī tiān.
Wednesday is the busiest day of this week.
老师说周三要交作业,别忘了。
Lǎoshī shuō zhōusān yào jiāo zuòyè, bié wàng le.
The teacher said homework is due on Wednesday. Don't forget.