brain-teaser
plural of Melendy
A compound thermionic valve containing a triode and tetrode; was used in superheterodyne radio receivers.
plural of Kyivite
A complex riddle or puzzle.
雑誌の裏表紙に載っていた頭の体操になる難問は、数学専攻の学生さえも困らせた。
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DiQt
Free
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