那里每年秋天有2,000头灰色小海豹出生。Two thousand grey seal pups are born there every autumn.为了获得海豹皮而用棍棒打死幼海豹是不道德的。Clubbing baby seals to death for their pelts is wrong.每年对海豹的选择性宰杀the annual seal cull...
研制一种新型超低频垂直隔振系统.A novel ultra - low frequency vibration isolator is established.控制电源输入, 实现了超低频电缆试验装置的输出幅值从0～30kV可调.By controlling input of power, the output from 0 ~ 30 kV of sinusoidal can be adjusted.在特征提取中还考虑了HRV中 超低频...