sub·trac·tive /-ˈtræktɪv/
(a.)減去的,有負號的,負的
Sub·trac·tive a.
1. Tending, or having power, to subtract.
2. Math. Having the negative sign, or sign minus.
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subtractive
adj : constituting or involving subtraction; "a subtractive
correction" [ant: additive]