destination, by telex or cable about its ETA (expected time of arrival)
该船抵达目的港前7天和24小时分别用电传或电报通知买方预计抵港时间、合同号、商品
Discussing problems of how to forecast ETA (estimated time of arrival) in given bad weather conditions of an air-space within the reach of monitoring radars.
研究了在危险天气条件下，在雷达管制空域下，计算航空器预达时间的问题。
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