streambed

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Within 30 minutes, I was marching up a dry streambed, above the trees, on a ridge matted with magenta shrubs and dotted by boulders.
差不多30分钟的时候，我走在一个干枯的河床，上面长着树，在凸起的地方遍布着红色的灌木丛和星星点点的石头。
Once the aquifer disconnect from the stream, the inverted saturated zone of the rectangular streambed show a hemicycle, and that of rectangular streambed show a vertical rhombus.
当河流与地下水脱节后，矩形河床的悬挂饱水带呈半圆形，三角形河床的悬挂饱水带呈直立菱形。
The molecules of the soil or streambed would become smaller and simpler.
土壤或者河床的分子会越来越小，越来越简单。

This is a transition from speculation about the size of streambed material to direct observation of it.
FORBES: Curiosity Finds Evidence Of Ancient Stream On Mars
Not to be outdone by its brother, Curiosity has found the first evidence of an ancient streambed on Mars near the Gale Crater.
FORBES: Curiosity Finds Evidence Of Ancient Stream On Mars
Mars rover Curiosity has found the remnants of an ancient streambed on Mars, providing still more evidence that water once flowed freely there.
FORBES: Curiosity Finds Evidence Of Ancient Stream On Mars