We may normally think of iron as a solid.
我们通常把铁看成固体。
Soft material do not carry sound so well as iron and other solid.
软性材料传递声音不如铁等固体那样好。
In general, they were not as hard and solid as wooden doors or iron gates.
总之，都不如木门、铁门来得坚实。
In general, they were not as hard and solid as wooden doors or iron gates.
总之，都不如木门、铁门来得坚实。
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