This is the 4028th most frequent Chinese word.
六四
"六四" (Liùsì) refers to the Tiananmen Square protests and crackdown on June 4, 1989, in China.
In this sentence, '六四' represents the date 'June 4th' in the Gregorian calendar. It is used to refer specifically to this date.
六四是一个日期，可以被用来纪念特别的事件。
June 4th is a date that can be used to commemorate significant events.
Here, '六四' refers to a historical event associated with this date, hinting at an event significant to history or politics.
六四问题涉及复杂的历史和政治背景。
The issue of June 4th involves a complex historical and political context.
In this usage, '六四' symbolizes broader concepts or themes, such as social change, rather than strictly referring to the date or events.