纳波利塔诺可能要求贝卢斯科尼下台，但他无法强迫他这样做。
Mr Napolitano may call on Mr Berlusconi to step down, but he cannot force him to do so.
主要波跟声波的特征相同，当地面被加压或减压时强迫向前和向后移动。
Primary waves are identical in character to sound waves. The ground is forced to move forwards and backwards as it is compressed and decompressed.
本文用线性化全球原始方程谱模式来研究地形强迫行星波的垂直传播过程及演变特征。
The vertical propagating process and evolutive characteristics of planetary waves forced by topography are investigated by a global linearized primitive equation model.
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