The water had raced down the slope and scoured out the bed of a stream.

水顺着山坡流下来，冲刷出一条小河道。

《牛津词典》

Critical shear stress as related to bed slope was calculated.

计算出了与沟坡相关的临界剪切应力。

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The process of fire spread from the lowest point of a slope to the maximum acceleration instant was simulated in a fuel bed.

同时，在燃料床上进行模拟实验，测取了林火自水平燃料床进入倾斜燃料床后的火蔓延速度和加速度。

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The sediment grains bouncing along the bed get pushed up the rearward-facing slope (stoss) and then avalanche down the other side (lee).

BBC: Curiosity Mars rover to investigate classic rock type

After a long day of studying data, including slope angles, solar energy, weather and powder patterns and nearby transportation facilities, Mr. Mathews occasionally goes to bed pondering problems and wakes up with solutions.

WSJ: Paul Mathews of Ecosign, Scouting the World for Killer Ski Slopes | Creating