101今日目标：掌握基数词的2个知识点。
1.基数词构成法：
读法和写法：从后往前三个数字一组，一般用单数来念，示例：1,123,456,789- one billion one hundred and twenty-three million four hundred and fifty-six thuosand, seven hundred and eighty-nine
2. 基数词在句子中的作用：
做主语、定语、宾语或介词宾语、表语、同位语等，其中基数词还可用于复数形式，比如 Tens of thousands of horses used to roam the prairie. 数以万计的马儿在草原上奔跑。
一些数学公式的读法：
Three plus eight is eleven. 3+8=11
nine minus two is seven. 9-2=7
six times( multiplied by ) five is thirty. 6*5=30
eight divided by four is two. 8/4=2
a is more than b/ a is less than b.
a approximately equals to b.
a is not equal to b.
学英语，找诚实哦~
