These may range from coarse silt to sand or pebble size.
这些颗粒的大小变化范围,从粗粉砂级到砂级或细砂级。
These particles range from coarse silt to sand or pebble size.
这些颗粒的大小变化范围是从粗粉砂级到砂级或细砂级。
Pilots can fly above a war zone and drop thousands of small wireless sensors, the size of a small pebble and costing a dollar apiece, over the terrain.
飞行员可以在战区上空飞行,在地面上扔下数千个小型无线传感器,每个传感器只有一块小鹅卵石大小,价格为1美元。
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