书籍 Headway – 基础 - 日常英语（第四单元）

a word, sign, or symbol that represents a specific quantity or amount

the number 19

describing a quantity that is one more than twenty

of the number 36; the number of months in three years

of the number 45; the number of degrees for half a right angle

the number 91; the number of minutes in a typical soccer game plus one

the number 66; the number of players on six soccer teams

of the number 100; the number of years in a century

of the number 1000; the number of meters in one kilometer

the number 1 followed by 6 zeros

the number 8

the number 10

the number 12

of the number 32; the number of pieces in a game of chess

the number 60

of the number 76; the number of legs on seven crabs plus six

the number 99; the number of players on nine soccer teams

the number 16

the punctuation mark . used to indicate that a sentence or an abbreviation is ended