powder down
Anything that flashes, especially a device that switches a light on and off. / (automotive) An indicator or turn signal. / (obsolete) Someone of great accomplishments, or brilliant appearance.
Audible speech.
plural of reacknowledgement
A special type of down that occurs in a few groups of apparently unrelated birds. In some species, the tips of the barbules on the feathers disintegrate, forming fine particles of keratin; in others, powder grains come from cells that surround the barbules of growing feathers.
飼育員は、オウムの粉状羽毛が微細な角質の粒子を生じ、吸い込むと肺を刺激することがあると説明した。
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