今年四月末，网上公布的一则视频显示一个女孩被一群高年级女孩频扇耳光，曾一度在社会上引起热议。
In late April, a video that showed a schoolgirl being repeatedly slapped by a group of older girls went viral.
华南地区在中强震发生前有4级左右地震频繁活动和小震群频发的特点。
Before the moderately strong earthquakes in the region there are frequent seismic activity with magnitude of 4 or so and small earthquake swarms.
初步认为荣成震群是一次频发性震群，不是前兆震群。
It is suggested that the swarm might occur frequently and was not a precursory one.
本文研究海洋环境噪声与舰船噪声的频间相关与群延迟特性。
The characteristics of frequency correlation and group time delay of ambient noise and ship radiated noise in the sea are studied.
该平台可实现定频或扫频射线轨迹演示，计算各射线群路径，覆盖区域等功能。
This platform can simulate the ray tracing for a fixed frequency or sweeping frequencies, also can calculate the group path and the covered region of rays.
研究了群色散和非线性频移随频率和薄膜厚度的变化规律。
The variations of group velocity dispersion and nonlinear frequency shift with the wave frequency and film thickness are also studied.
计算了规则波和波群中系泊浮筒漂移运动的时间历程，讨论了其运动与波高、频差的关系。
The time history of drift motion of mooring buoy in regular wave and wave group is calculated. The relation between drift motion and wave height or difference of frequency is discussed.
计算了规则波和波群中系泊浮筒漂移运动的时间历程，讨论了其运动与波高、频差的关系。
The time history of drift motion of mooring buoy in regular wave and wave group is calculated. The relation between drift motion and wave height or difference of frequency is discussed.
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