Taking sea target surveillance and hitting system for example, the top-level demands are described using user case diagram, class diagram, activity diagram and collaboration diagram in UML.

以海上目标监视与打击体系为例，给出利用UML中的用例图、类图、活动图、协作图对体系顶层需求进行描述的方法。

youdao

This is caused by the complexity of underwater target radiated noise and the variety condition of the sea.

这是由于水下目标辐射信号和海洋环境的复杂性、多变性造成的。

youdao

This thesis researches the detection algorithm of small target under sky background and sea-sky background.

本文着重对天空背景和复杂海天、海面背景下的弱小目标检测算法进行了深入研究。

youdao

"Although China still has a long way to go before it has continuous real-time tactical coverage, even of a regional maritime environment, it now has frequent and dependable coverage of stationary targets and at least a basic ability to identify, track and target vessels at sea, " they wrote.

WSJ: Beijing Launches GPS Rival

Building social impact campaigns that reach target audiences in the sea of online noise generated by Facebook and Twitter can be daunting.

FORBES: Navigating Social Innovation: Road Trip to the National Conference on Volunteering

On the night of the triple bombing, a sea-borne raid on a Hizbullah target in south Lebanon went horribly wrong, killing 12 officers and men of an elite Israeli commando unit.

ECONOMIST: Albright��s perilous debut