In 1993 Mr Clinton, facing similar tension, ultimately sided with the deficit hardliners. If anything, the pressures on Mr Obama are even more acute. With baby-boomers about to retire in growing numbers, the cost of America's public-health and retirement programmes, if left unchanged, will rise from 8% of GDP now to 19% by 2050. Some economists dream that the time is ripe for a grand bargain that reforms the tax code, entitlements, and health care simultaneously, boosting productivity, raising revenue, expanding health-care coverage and putting the budget on the path to long-term balance.
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With baby-boomers about to retire in growing numbers, the cost of America's public-health and retirement programmes, if left unchanged, will rise from 8% of GDP now to 19% by 2050.
越来越多的婴儿潮时期出生的人逐渐进入了退休的阶段，如果现状不变，美国的公共医疗和退休金的花费到2050年将会从GDP的8％上涨到GDP的19％。
The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.
蜗牛或蛤蜊的空壳可能会被留下来，如果足够持久和抗溶解，它可能会在很长一段时间内基本保持不变。
This means that if you change PDP vendors, which are often proprietary, the PEP can be left unchanged.
这意味着，在更改pdp供应商(经常具有专用性)的情况下，可以不用更改pep。
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