sluice box
(dated, inorganic chemistry) Any borane that has more hydrogen atoms than another that has the same number of boron atoms
plural of king post
A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box.
(botany) Related to, or exhibiting flexistyly
採掘者は雨の後、流水に底にリフル（溝）が付いた箱を設置して、流れてくる砂利の中から金を選り分けた。
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