加：plus/add
减：minus/subtract/take away...
乘：multiple by.../times
除：divide by
例如：2＋3＝5就是2 plus 3 equal to 5./ 2 add 3 equal to 5
10-1＝9就是10 minus 1 equal to 9 ； 10 subtract 1 get 9； 1 is subtracted from 10，and equal to 9；10 take away 1 is 9。等等～
加：plus
减：minus
乘：times
除：divide by
加 Plus
减 By
乘 By
除 In addition to
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