This is the 5707th most frequent Chinese word.
参
"参" means "to participate," "to join," or "ginseng," depending on context.
In this sentence, '参' is part of the word '参观' which means 'to visit'. It implies actively going to see a place or activity.
我今天要去参观博物馆。
I am going to visit the museum today.
Here, '参' is part of the word '参加' which means 'to participate'. It indicates being actively involved or taking part.
我参加了一个篮球比赛。
I participated in a basketball match.
In this context, '参' appears in the word '参差不齐' which describes something as uneven or inconsistent.