"Indeed, it is so" or simply "Indeed" can be used to express that "事实确实如此".
This phrase is commonly used to express agreement or acknowledge that something is true or accurate.
Examples:
"Do you agree that the company's profits have increased this quarter?"
"Indeed, the reports show a significant growth."
"Is it true that Jane won the championship?"
"Indeed, she has been training very hard for it."
Note: "Indeed" can also be used as an adverb to express strong affirmation or confirmation, such as "She indeed has the skills for the job."