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.
plural of concave envelope
An picnic in which attendees bring their teddy bears, typically as an organised community event.
A surname from Norman. / A census-designated place in Bladen County, North Carolina, United States.
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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