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Refractory
If you use firebricks round the walls of the boiler, the heat loss. Can be considerably reduced.
If you use firebricks round the walls of the boiler, the heat loss, can be considerably reduced.

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Open the tool →耐火 (nài huǒ) means “Fireproof, Refractory”.
耐火 is pronounced nài huǒ in Mandarin Chinese.
“Fireproof” is 耐火 (nài huǒ) in Chinese.
This page has 2 example sentences using 耐火, each with pinyin and an English translation.