预热器由 321不锈钢管和渗铝 20g管组合而成，使用寿命长。的翻译：Preheater consists of 321 stainless steel tube and aluminized 20G a combination of, long service life. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Preheater tubes of 321 stainless steel and aluminized 20g tube combination, long service life.

Preheater consists of 321 stainless steel tube and aluminized 20G a combination of, long service life.

The pre-heater and aluminizes the 20g tube combination by 321 stainless steel pipes to become, the service life is long.

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Preheater consists of 321 stainless steel tube and aluminized 20G a combination of, long service life.