1.
The study of survey on environment infrasound and biologic effect of infrasound on hippocampus of mouse;
环境次声测量及次声对小鼠海马部分生物学效应实验研究
2.
Effects of infrasound with low sound pressure level on rats with cerebral ischemia-reperfusion injury
低声压级次声对大鼠脑缺血再灌注损伤的影响
3.
We heard repeated knocks on the door.
我们多次听到敲门声
4.
A good shot rtaises a laugh.
次妙投，引起一阵欢呼声。
5.
The guy's voice comes back on the line.
那个男士声音再次响起，
6.
The implications of sheng in Music without Sadness and Happiness by Ji Kang;
《声无哀乐论》中“声”的三个层次
7.
Research on Multi-channel Adaptive Active Noise Control Systems for Reducing Vehicle Interior Low Frequency Noise;
车内低频噪声多次级声源有源消声系统研究
8.
Last time I went with a flourish trumpets, but now I want to go without any fuss at all.
上一次我走得声势浩大，可这次我要走得不出一点儿声响。
9.
Improvement of Accuracy and Noise Suppressing Performance of Anemometer Based on Twice Correlation Method
用二次相关提高超声测风精度和噪声抑制性能
10.
Optimal strategy for the second source in enclosure under active noise control
封闭空间有源噪声控制次级声源优化策略
11.
Rings to Answer 1,2,3,4,5,6
响铃次数（设置铃声响几次后自动应答传真）
12.
This was the first of several laughs that showed how little I understood.
那是表露我毫不知情的几次笑声中的第一次。
13.
The tinkling laughter burst forth again.
那银铃般的笑声再一次响起。
14.
The sound In line with the time
按照时间，钟声响相应的次数
15.
No noise had sounded since the first knocks.
第一次敲门之后，就再没听到声音。
16.
Nobody appeared when she called in subdued tones.
她低声喊了几次都没有人出来。
17.
Nobody appeared when she called in subdued tones cellar.
他低声喊了几次都没有人出来。
18.
Just then came a second knock on the door,
就在此时，传来第二次敲门声，