symmetric key对称密钥symmetricadj.对称的；匀称的symmetric viewing field对称性视域symmetric wave function对称波函数symmetric transcription对称性转录symmetric neighbourhood对称邻域symmetric bilinear form对称双线性形式symmetric cross entropy对称交互熵（SCE）symmetric multivibrator对称多谐荡振器symmetric key algorithm对称密钥算法symmetric muhiprocessor对称多处理机（SMP）symmetric half-bridge对称半桥