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单语范例（未经PONS编辑处理）
A removable refractory plug allowing access to the tunnel was added in the back of the unit.
en.wikipedia.org There are more than twenty deposits of refractory and fireclay.
en.wikipedia.org The duration of the refractory period varies considerably, even for a given individual.
en.wikipedia.org Refractory bricks are typically replaced every five years, because thermal fatigue gradually introduces fissures that reduce the insulating strength.
en.wikipedia.org Standard shapes have dimension that are conformed by most refractory manufacturers and are generally applicable to kilns or furnaces of the same types.
en.wikipedia.org 互联网提供的例句（未经PONS编辑处理）
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www.lenntech.de Advanced oxidation processes are particularly appropriate for effluents containing refractory, toxic or non-biodegradable materials.
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Weiterentwickelte chemische Oxidationsprozesse sind speziell für Abwässer geeignet, die besonders hartnäckige, giftige oder nicht-biologisch abbaubare Inhaltsstoffe enthalten.
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