7点半：half past seven;seven thirty
10点半:half past ten;ten thirty
3点45:a quarter to four;three forty-five
7点半用英语怎么说?10点半用英语怎么说?3点45用英语怎么说?
7点半：half past seven;seven thirty
10点半:half past ten;ten thirty
3点45:a quarter to four;three forty-five