Last Updated
：2025/11/19
Quizzes for review
A small hole in a steam boiler for the insertion of the hand in cleaning, etc.
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hand-hole
Before the technicians began scrubbing the boiler, one of them reached through the hand-hole to dislodge the scale.
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Before the technicians began scrubbing the boiler, one of them reached through the hand-hole to dislodge the scale.
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English - English
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