back boilers
simple past tense and past participle of DL
(mathematics) An anabelian category or similar structure
(of a firearm) To be discharged prematurely, or with the trigger at half cock. / (slang) To do or say something without due thought or care.
plural of back boiler
多くの古い家屋には、暖炉の背面に取り付けられたボイラーが給湯のために設置されていました。
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