周四 is formed by combining the character 周, meaning "week", with the character 四, meaning "four"; together they literally signify "week four", denoting Thursday as the fourth day of the week.
Example Sentences
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今天是周四。
Jīntiān shì zhōusì.
Today is Thursday.
这周四我们要考试。
Zhè zhōusì wǒmen yào kǎoshì.
We have a test this Thursday.
会议被改到周四下午了。
Huìyì bèi gǎi dào zhōusì xiàwǔ le.
The meeting has been changed to Thursday afternoon.
本来计划周四去，但下雨了。
Běnlái jìhuà zhōusì qù, dàn xiàyǔ le.
We originally planned to go on Thursday, but it rained.