sounding

n. (original nautical sense) probing to ascer-tain the depth or bottom,fathoming; investigation of one's innermost feelings by cautious or indirect ques-tioning （原为航海用语）探测水深；（转义）探测心事。
△Rom1.1.155 (150): “So far from sounding and discover-y，” i.e. it is impossible to discover Romeo's hiddenthoughts. 令人无从探测他的内心。

sounding水深测量

指测定水深用的几种技术。最简单的方法是铅锤测深法。各种船舶上广泛使用回声测深仪和声纳装置，测出声音从水面到达水底部再反射回来所需的时间，从而测出水深。