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    1.is equal to; is the same as =
    the result is; yields; gives
    2.the sum of x and y; the total of x and y;
    x added to y; x increased by y; x+y
    x more then y; x greater than y
    3.x minus y; x less y;
    the difference of x and y; x take away y;
    from x subtract y' x decreased by y; 　x-y
    x diminished by y; y is subtracted from x;
    y less than x (note the reversal)
    4.　x multiplied by y;
    the product of x and y; xy
    5. divided by y;
    the quotient of x and y; x y，
    y divided into x (note the reversal)
    6.　A and B are factors of C;
    A and B are divisors of C;
    C is divisible by A and by B; A B=C
    C is a multiple of A and of B;
    A divides C and B divides C;
    7. the ratio of a to b 　a：b，
    8. reciprocal of x
    9. x times as many z as y; 　z=x y
    10.　a squared;
    a to the second power a2
    11. a cubed; 　a3
    a to the third power
    12. between a and b 　 (a，b)
    between a and b， inclusive 　[a，b]
    13. off 　低于，從……中扣除
    14. account for 　占
    15. third
    16. of x (a fraction of x); x，0.75x
    75% of x (a percent of x)