正三和弦 Primary triad ; Principle chord ; IIVV ; Principle triad

正七和弦 Primary seventh-chord ; Principle chord of the seventh

码器和正弦变换编码器 Sinusoidal Transfer Coding ; STC

和离散正弦变换 discrete sine transform ; DST

接口和多正弦曲线寻道 Multi Sinusoidal Seek ; MSS

正弦振动和随机振动 Sinusoidal and random vibration