不过，对测定目标物距离来说，声波运行的速度太慢，因此，声波回声测距法在实用中有其局限性。

Thus this soundwave echo method has its limitation in practical use.

youdao

针对单向网络性能测量过程中存在的时钟同步问题，提出了基于法向距离最小的优化目标。

For the problems of clock synchronization in one-way network performance measurement. This paper puts forward the optimizing goal of minimizing normal distance.

youdao

本文先用面积法求出线式巡逻潜艇发现目标的概率，然后对潜艇发现目标距离作了分析。

This article first works out the finding probability of linear patrol submarines through area method. then analyses the find distance of patrol submarines.

youdao