He found that the length of time it takes a sound's echo to decay is determined by the absorption of the sound's original energy by surrounding material.
他发现，声音回声衰减的时间长短取决于周围物质对声音原始能量的吸收。
2
Lining the perimeter of Echo Base on Hoth were a series of cylindrical gun towers painted in the same stark white as the surrounding landscape.
在霍斯星球回波基地的环形防线上，排列着一系列与周围地貌一样全白的圆柱形炮塔。
3
Layout: Controlling the scale, break up the whole into parts and slope roofs echosurrounding farm house.