Sand on the bottom whiter than chalk
海底的沙子比白垩更白
The sand bailer is also used as a bottom hole sampler.
捞砂筒也可用作业井底取样器。
水底是干净的沙砾。
The sand in the water gravitated towards the bottom of the bottle.
海关官员拧开瓶盖，把瓶子放到鼻子底下。
The development and evolution of sea bottom sand ridges and sand ripples are discussed.
讨论了海底沙脊和沙波发育演变问题。
The bottom layer is a mixture of sand and clay.
最下面的一层是沙和泥的混合物。
The bottom layer is a mixture of sand and clay.
最下面的一层是沙和泥的混合物。
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