The key is to gradually raise this baseline.

关键问题在于逐步提高这一底线。

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It is love, that gradually raise in fragrant garden of flowers.

氤氲的芬芳，是爱，冉冉升起。

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As demand increases, airlines are likely to gradually raise airfare rates, experts say.

因为专家认为，随着需求的增加，航空公司可能将逐渐抬升票价。

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But their most provocative proposal would gradually raise the Medicare eligibility age from 65 to 67.

FORBES: How to Cut The Budget Deficit

We should gradually raise revenues and trim benefits in a way that establishes long-term solvency without hurting vulnerable seniors.

FORBES: We Don't Need Another Short-Term Patch for our Fiscal Woes

Second option is to gradually raise the retirement age.

WHITEHOUSE: Town Hall in Arnold, Missouri