thu代表星期四，THU等于Thursday，所以是星期四。
读音：/ ˈθɜːzdeɪ /
表达意思：星期四。
词性：通常在句中作名词，作为主语或宾语。
固定搭配：rainy Thursday多雨的星期四；Carnival Thursday星期四；foggy Thursday多雾的星期四。
例句：
1、Thursday is market day.
星期四是赶集日。
2、A freeze warning was posted for Thursday night.
据警报星期四夜间有霜冻。
3、I went to Paris on Thursday, and came back the following Monday.
我星期四去了巴黎，第二周的星期一就回来了。