concave envelopes
(chemistry) A heterocyclic compound containing a diazepine ring fused to thiophene and triazole rings, and forming the central core of several pharmaceutical drugs.
A surname from Norman. / A census-designated place in Bladen County, North Carolina, United States.
An picnic in which attendees bring their teddy bears, typically as an organised community event.
plural of concave envelope
博物館の展示では、実験的な文具コレクションに含まれる凹状の封筒が並んでいた。
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