例句與造句

1. On 8 August Rines'Raytheon DE-725C sonar unit, operating at a frequency of 200 kHz and anchored at a depth of, identified a moving target ( or targets ) estimated by echo strength at in length.
2. The distance to which the radar can detect an object is proportional to the square root of the object's size, due to the one-over-distance-to-the-fourth dependence of echo strength.
3. It's difficult to find echo strength in a sentence. 用echo strength造句挺難的