ze.ro-sum

adj.（形容詞）
Of or relating to a situation in which a gain is offset by an equal loss:
零和：得失互抵情形的或與其相關的：
例句：
.. . .under the zero-sum budgeting system that governs federal spending, the money for spinal research is likely to be deducted from some other research account.(Daniel S. Greenburg)
.由于采用零和預算制度控制聯邦政府的支出，用于脊椎研究的費用可能會從其它研究預算中扣除.(丹尼爾·S·格林伯格)