For underwater acoustic positioning system based on measurement of time_delay, range ambiguity appears when pulse's propagating time is longer than its repetition period.
基于时延测量的水声跟踪定位系统，当信号传播时延大于脉冲重复周期时，就会出现距离模糊。
At present stage in China, tourism in rural areas is one for leisure, with the characteristics of short period, short trip, low consumption and repetition.
我国现阶段乡村旅游属于休闲旅游，有短时、短途、低消费、重复的特征。
In contrast to traditional shipbuilding mode, this method can sharply lower the rate of repetition and material wasting in pipe design and arrangement period.
该方法与传统造船模式相比，可大大降低管系设计与布置中的返工率和管材浪费。
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