safety device 安全装置 satellite 卫星 satellite communication 卫星通讯 saturated vapour 饱和蒸气，饱和汽 saturated vapour pressure 饱和蒸气压，饱和汽压 saturation 饱和 saturation current 饱和电流 sawtooth voltage 锯齿波电压 scalar 标量，无向量 scalar product 标积，无向积 scale 标度，比例尺，音阶 scaler 脉冲计数器 scan 扫描 scattering 散射 scattering analogue 散射模拟 scattering angle 散射角 scintillation 闪烁 screen 屏，幕 screened lead 屏蔽导线 screw 螺旋，螺丝钉 screw driver 螺钉起子，螺丝批 screw jack 螺旋起重器 sealed radioactive source 密封放射源 search coil 探察线圈 second 秒 second law of thermodyn