High frequency noise of gears is mainly from tooth error and base pitch, and low frequency noise from accumulated errors of tooth spacing.
齿轮高频噪声产生的主要原因是齿形误差和基节偏差；低频噪声产生的主要原因是齿距积累误差。
The runner went to second base on a wild pitch.
一记瞎设让跑垒员跑上了第二垒。
A stone plinth mediates the steep pitch of the site creating both a cloistered parking court as well as a base on which the two story house rests.
石头基座缓和了场地陡峭斜坡的影响，创建了隐秘的停车场以及其上的两层房屋。
The bronze musical instruments, as the one with fixed pitch, along with its musical temperament design, pitch tuning, it became an important material base to pursue Song new music system.
作为固定音高的青铜乐器，编钟的铸制与音律设计、音高调试，成为宋代新乐议制和推行的重要物质基础。
There are many ways to measure base-level pitch diameter of cone-shaped thread.
检测圆锥管螺纹基面中径的方法有很多，但测量过程复杂。
And probe into the problem of how to project a speech recognition system base on the hardware, also the problem of pitch estimation.
并探讨语音识别在硬件上的实现以及基音周期估值等具体问题。
After carbonization, the high melting pitch-base carbon fibers are activated in CO2 atmosphere at certain temperatures. The activated fibers have good adsorbent function and regenerative behaviour.
耐熔性沥清基纤维经过碳化处理后，在一定温度下的CO_2气流中进行活化处理，得到的活性碳纤维具有良好的吸附性和再生性。
Simulation results show that the important factors of influencing fin heat sinks 'cooling effect are fin pitch, fin thickness, base thickness and fin height.
仿真结果表明，影响翅片式散热器散热效果的重要因素为翅片间距、翅片厚度，基座厚度和翅片高度。
The equations for thread taper, thread pitch, thread angle and height of thread can be derived on the base of fitted lines, which are accurate enough to meet the needs of industrial measurement.
该方法可测量螺纹的锥度、螺距、螺纹夹角和螺纹高度，测量精度可以满足工业测量要求。
Even in base ball, umpires have discretion in calling strikes. The umpire rules whether the pitch was on the corner or whether the batter checked his swing.
甚至在恶劣的球中，裁判员酌情呼吁停止。而裁判规则，不论是草地的角落，或是击球手是否检查他的摆幅。
But to ask what happened before the Big Bang is a little bit like asking who was on base before the first pitch was thrown out in a game, say between the Yankees and the Red Sox.
但要问大爆炸之前发生了什么，这就有点像在一场棒球比赛中，第一个球被投出之前谁正在垒位上一样。
But to ask what happened before the Big Bang is a little bit like asking who was on base before the first pitch was thrown out in a game, say between the Yankees and the Red Sox.
但要问大爆炸之前发生了什么，这就有点像在一场棒球比赛中，第一个球被投出之前谁正在垒位上一样。
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