bottom echo meaning in Hindi

Examples

1. An universal equation , which can be directly used to compute the compensation resulted by the surface roughness , was deduced according to the flat - bottomed echo formula
2. The echo of single hole was high , its front was steep edge ; the echo of dense hole was connected and uneven ; the echo of crack was high and keen - edged , the bottom echo was decline in some certain ; the echo root of bird ' s net had some small wave followed