Utah roundmouth snail
Valvata utahensis, a freshwater snail with a gill and an operculum, endemic to the United States.
The mechanism in a sawmill that positions the log for the next cut.
The process by which something is cheapened or made vulgar.
The etymology of characters and their structure, such as those in Chinese.
淡水の生物多様性を研究している研究者たちは、その川でアメリカ固有の巻貝 Valvata utahensis(エラとオペルキュラムを持つ淡水種)の個体群が減少していることを発見して驚いた。
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