A book has 70 pages, each page has 20 lines, and each line has 25 characters. About how many words are there in this book?
一本书共70页，每页有20行，每行25个字．这本书大约有多少个字？
<gadget id="calculator">25 * 20 * 70</gadget>
<output>35_000</output>

<result>35_000</result>