采用缩尺模型，可以减小试验难度，降低试验成本。
By using the scale model, we can reduce the difficulty and costs of experiments.
他最开始尝试小规模水流发电，但是，他说试验成本太高了。
He first tried to use water currents hydro power on a small scale, but said the experiment became too expensive.
实验证明，该方法可降低试验成本，提高实验效率和准确性。
The experiments proved that the method could cut test cost, increase test efficiency and accuracy.
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