The limiting factor, Cui explained, is the availability of freshwater for the start of the process.
崔解释说，其中的限制因素是启动这个过程所需的淡水的可用量。
2
By the analysis of link budgets and visibility-limiting weather conditions, the link availability and link distances as a function of distance can be predicted for any FSO system.
The formulas for instantaneous availability and limiting steady-state availability are presented for several cases which people meet often in practice.