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The gap between piston and cylinder wall of an internal combustion engine is small, however it may induce the piston secondary motion periodically and generate unwanted sound and vibration.

由于活塞缸套之间存在间隙，活塞在缸套内会产生横向及绕活塞销旋转运动，称之为活塞二阶运动。

It is available to carry out numerical simulation and fluid dynamic analysis further. Based on Frozen-Rotor Approach and Rotor-Stator Approach, the numerical simulation was carried out in the centrifugal pump and the numerical results showed that the flow in the impeller and volute of centrifugal pump is periodically unsteady. Due to the interaction between impeller and volute the flow is characterized by pressure fluctuations and it is the strongest at impeller outlet and at the vicinity of the tongue. The unsteady pressure fluctuations are also one of the most important reasons to induce vibration and noise. Secondly, the flow field of the volute is characteristic of the vortex flow, and the vortex flow presents very complicated developing process which is creating, increasing and dissipating every now and then. All these lead to very large flow loss in the volute.

采用Frozen-Rotor冻结转子模式和Rotor-Stator滑移界面模式系统开展了不同工况下离心泵内叶轮与蜗壳耦合的定常和非定常流动研究，结果表明由于叶轮与蜗壳的干扰蜗壳进口周向流动的不均匀性是非常强烈的，特别是叶轮与蜗舌间的相互干扰最为强烈，一直影响到叶轮进口和蜗壳扩散管出口的流场；在蜗壳内整个流动是以旋涡形式向出口推进的，并随着包角的变化旋涡表现出十分复杂的产生、发展和耗散的演化过程，导致蜗壳内较大的流动损失。

As the admission pipe to valve cavity is sealed up, condensate flows into valve housing through the drain sump and admission pipe, the inverted bucket sinks and opens the discharge valve opening to start water discharge periodically.

由于通往阀腔的进汽管被密封，凝结水从集水仓流经进水管进入阀腔，倒吊桶下沉，打开排水阀嘴，周期性的开始排水。

A design of temperature sensor with differential output is given, and its sensitivity as the function of temperature is analyzed theoretically and simulated. The theoretical model of response characteristic of viscous damping microbeam system under periodically driven force is built.

在此基础上，进一步从理论上分析了残存应力对微桥固有频率的影响，推导了微桥固有频率同温度的函数关系，提出了一种差动式谐振温度传感器的设计构想，并对其灵敏度随温度的变化进行了理论分析和模拟计算。

Myzus persicae also occurred periodically as that of the turnip aphid, but appeared several months later and almost constantly occurred in November during the three years.

7黄条叶蚤发生盛期因年而异，但以5-12月之虫数较1-4为高。(8)伪菜蚜每年9月至次年2月为其发生盛期，高举期受8月降雨量多寡之影响，而出现在9、10或次年1月。

AMC selection module periodically measures the wireless channel, updates the state transition matrix of finite-state Markov chain to trace the channel status, and dynamically selects transmission mode, which includes modulation and forward error coding, so as to guarantee packet error rate performance and improve spectrum efficiency.

AMC选择模块周期性地测量无线信道，更新马尔可夫模型转移概率矩阵以跟踪当前的信道特征，动态选择物理层传输模式（包括调制方式和前项纠错编码方式），在保证系统误包率要求的同时，最大可能地提高系统频谱效率。

Each cyclist should carry an air pump so the tire can be periodically inflated and the ride continued.

每个自行车应进行空气泵，因此可以定期轮胎充气和乘坐继续。

Each cyclist should carry an air pump so the tire can be periodically inflated and the ride continued.

每个车手要携带空气泵，使轮胎可以定期膨胀，该机继续进行。

Symptoms: production, has been periodically appear book letter to feed the transmitter to feed got in place, resulting in the book letter longer than book block head or tail.

故障现象：生产过程中，曾周期性地出现书封喂送器喂送不到位的情况，导致书封长于书芯天头或地脚的现象。

Although it cannot perceive vibration messages from followers that are seeking a food sample, the operator periodically grants a sugar-water sample.

虽然机器蜂无法感知周围寻找食物样品的真蜂发出的振动信息。操纵机器的科学家定期供给糖水样品。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。