众所周知，木材是容易腐朽的。
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)。
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）。
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.
竹材是一种重要的森林资源，但容易腐朽霉变，在户外使用受到限制。
Bamboo, a kind of forest resources only less important than wood, is especially easy to mildew during outdoor service.
竹材是一种重要的森林资源，但容易腐朽霉变，在户外使用受到限制。
Bamboo, a kind of forest resources only less important than wood, is especially easy to mildew during outdoor service.
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