alluvial fan
(organic chemistry) Either of two isomeric phenols derived from naphthalene; they are used in the preparation of dyes and many other compounds
plural of chokey
A cone-shaped heap of alluvium deposited by a river.
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地質学者たちは峡谷のふもとにある川によって堆積した扇状地を調べ、川の流れが時間とともにどのように変化したかを解明した。
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