随着全球变暖，涝灾频发、飓风不断、海面上升、连年干旱等灾害，数以百万的人将被迫背井离乡，甚至由此引发范围更广、灾情更糟的严重后果。
As THE planet warms, floods, storms, rising seas and drought will uproot millions of people, and with dire wider consequences.
在实例模拟中，对计算速度和精度、空间假频、截断效应等给出了相应的解决方案。
In real data simulation, the programs for solving computing speed and precision, space aliasing and truncation effect were also given.
分析、比较了测频率法、测周期法、等精度测频法等几种常用测频方法的原理及误差。
The differences of principle and precision between frequency measurement method, cycle measure method, and equivalent precision frequency measurement method are compared.
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