total number number是否加S

total number number是否加S total number of bridges in U.S. Total number of rooms total number of pallet The total number of 中文 number. 请问 number,sum,quantity ,total的区别? What’s the total number of female teachers and male students what's the telephone number?中number要不要加s? a number of ,the number of之中哪个和total number of一样? What's his number? what's the number