Limit-preserving function 极限保持函数
sign-preserving theorem of limit 极限保号性定理
limit preserving
限制保护
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The Federal Reserve should have two key tasks--and only two: preserving the integrity of the dollar and dealing vigorously with financial panics to limit unnecessary damage.
FORBES: Magazine Article
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