整个装置由两套相同的激光光幕构成，用以获取弹丸通过两个光幕的时间间隔。
The system composes of two kind of laser curtain to obtain the time interval of passed bullet.
定义：根据传统烹饪方法和有机配料精心准备并慢慢享用以获取最大收益的食物。
Definition: food which is carefully prepared using traditional cooking methods and organic ingredients, and is intended to be eaten and enjoyed slowly for maximum benefit.
特征提取是水声目标分类的关键环节之一，用以获取各类目标的一些可鉴别性特征。
Feature extraction is one of key steps in underwater target classification system, to obtain some discriminatory information of various kinds of underwater targets.
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