例句與造句

1. Direct measurement is done through the use of a physical trap, placing the device in contact with the bed,  allowing the sediment transported as bedload to accumulate ( or be trapped ) inside the sampler for a certain amount of time, after which the sampler is raised to the surface and the material is emptied and weighed to determine a weight transported per unit time . " Measurements of bedload discharge are rare and frequently of unknown accuracy because no bedload sampler has been extensively tested and calibrated over a wide range of hydraulic conditions.
2. It's difficult to find bedload sampler in a sentence. 用bedload sampler造句挺難的