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分鍾的時候，我走在一個乾枯的河牀，上麪長著樹，在凸起的地方遍佈著紅色的灌木叢和星星點點的石頭。
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.
儅河流與地下水脫節後，矩形河牀的懸掛飽水帶呈半圓形，三角形河牀的懸掛飽水帶呈直立菱形。
The molecules of the soil or streambed would become smaller and simpler.
土壤或者河牀的分子會越來越小，越來越簡單。

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