众所周知，木材是容易腐朽的。

It must be accepted that wood is perishable.

youdao

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.

youdao

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.

youdao