In particular, the claims made for the transport of inhibitors through hardened concrete need to be assessed.

特别是阻锈剂通过硬混凝土的渗透，是需要评估的。

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Some believe that the hardened gray iron used to make the components simply "fatigues" with age-as metal parts that go through millions of stress reversals eventually do.

有些人认为硬化的灰铸铁过去曾使零件很容易腐朽老化(因为经过数百万次的应力反向处理后的金属零件最后都会这样)。

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For ammunition to break through, artillery shells need to be hardened by adding certain minerals to the steel.

为了让炮弹能够打穿，弹壳的钢里需要加入一定的矿物质来增加硬度。

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Fewer than 100 hardened terrorists have gone through the program since it began in 2002, and of those, less than a third required any special methods of questioning.

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But in virtually every other regard, Team Obama has bought time for the mullahs to complete their nuclear weapons program and efforts to render it essentially invulnerable to attack through relocation of enrichment operations to hardened underground factories.

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Then the friends ship off to Vietnam, are hardened by the insanity they live through there, return to an America that offers them little opportunity, and turn to crime.

NEWYORKER: Dead Presidents