炉膛的英文：
hearth

参考例句：

Fettle:To line the hearth of (a reverberatory furnace) with loose sand or ore in preparation for pouring molten metal.
涂(炉膛):为倒入熔化的金属作准备而用松散的沙子或矿渣涂(反射炉的)炉膛.

Loose sand or ore used to line the hearth of a reverberatory furnace in preparation for pouring molten metal.
为倒入熔化的金属作准备的用来修整反射炉炉膛的松散砂子或矿渣.

hearth是什么意思：
n. 炉床，灶台，炉边，(比喻）家庭生活，家

I felt cozy watching the hearth fire.
看着炉火我感到温暖而舒适。

The muddy prints of small sandals were still wet upon my hearth
地面上留下的泥脚印还没干。

The goddess of the hearth, worshiped in a temple containing the sacred fire tended by the vestal virgins.
维斯塔女灶神，供奉在庙里，在里面有由灶炉仙女们照料的圣火 。

The hearth is the lowermost cylindric part of the furnace. It is used to contain molten iron and slag.
炉缸在炉子的最下部，呈圆柱形。其作用是容纳铁水和炉渣。

Two benches, shaped in sections of a circle, nearly enclosed the hearth
两条长凳，摆成半圆形，几乎把炉火围起来了。