In time and space, the environment is heterogeneous.
在时间和空间上，环境是异质性的。
A general model of random walk in time-random environment in any denumerable space is established.
文章在可数状态空间中建立了时间随机环境下随机游动的一个广泛的模型。
Ocean channel is such a complex environment that it varies in space, time and frequency.
海洋水声信道是一种极其复杂多变的时-空-频变参信道。
Ocean channel is such a complex environment that it varies in space, time and frequency.
海洋水声信道是一种极其复杂多变的时-空-频变参信道。
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