During the first half of the century, short-range forecasts were based on synoptic principles, empirical rules and extrapolation of pressure changes.

本世纪前半期，短期天气预报常以天气学原理，经验规律以及对气压变化进行外推为基础。

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During the first half of the century, short-range forecasts were based on synoptic principles, empirical rules and extrapolation of pressure changes.

本世纪前半期，短期天气预报常以天气学原理，经验规律以及对气压变化进行外推为基础。

youdao