sand martin
plural of burh
A migratory passerine bird of the swallow family, Riparia riparia.
(arithmetic, computing, uncountable) The number system that uses the eight digits 0, 1, 2, 3, 4, 5, 6, 7. / (arithmetic, computing, countable) A digit or value in the octal number system.
of, or pertaining to, resin / (physics, dated) negative (of electric charge)
川の上を低く滑空して機敏に飛び回りながら虫を捕えていたのは、渡りをするツバメの一種（Riparia riparia）だった。
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