The prospector panned off bits of sand and gravel scooped from the bed of a stream.
探矿者淘选从河床中挖出的少量含金泥砂和沙砾。
Stream gradient and bed sand constituent are the main factors which is influencing on river pattern formation in the boundary condition.
河道比降、床沙组成是河道边界条件中影响河型形成的最主要因素。
It USES a thin stream of falling sand to measure time.
它使用一小股落下的沙子来计算时间。
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