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insulation /ˌɪnsjuːlˈeɪʃən/ n

中文：隔热层

中文 · 隔热层Español · aislamientoFrançais · isolant
Meaning：Material covering the sides of the boiler to reduce heat loss.
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Found in these illustrated scenes（3）

Oil-fired water boiler Electric water heater tank Gas water heater tank

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