This is the 4418th most frequent Chinese word.
指是
"指是" means "refers to" or "indicates."
指是 is used here as a reference or indication towards a subject, emphasizing the book's content.
这本书指是关于历史的。
This book refers to history.
指是 denotes causation or attribution, connecting the success to its reason, hard work.
他的成功指是努力的结果。
His success is attributed to the result of hard work.
指是 implies pointing or referring to something, requesting clarification of what is being mentioned.