The following M—mode echocardiographic manifestations were noticed: 1. There appeared a fluttering and anteriorly moving lineal echo in the aortic lumen during systole;
其M型超声心动图表现为：1。主动脉腔内舒张期可见一条扑动的线性回声；
The simulation results indicate that the generated chaff echo of this method has the same distributions of the actual chaff echo. Thus it proves the correctness of this m…
仿真结果表明，该方法产生的箔条回波信号与箔条实际回波的各项分布特性相同，从而证明了该方法的正确性。
The mike recorded my clap and the echo after about 6 ms--giving about 320 m/s--very close to the correct value for the speed of sound at standard conditions.
麦克风在大约6秒后记录到了我的拍手声和回声--给出的值为320m/s--非常接近在标准条件下的正确音速值。
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