往复

In both of these scenarios, astronauts can be periodically resupplied from Earth itself.

在这两种情况下，太空人可以周期性地从地球往复提供食物。

When two axes make the synchronized reverse rotation, on each instantaneous two axis eccentric qualities produce the centrifugal force of inertia, always mutually counterbalances along x-x force component, but always mutually superimposes along Y-Y force component, this has formed the sole this direction simple harmonics strength.

两轴作同步反向回转时，每一瞬时两轴上偏心质量所产生的离心惯性力，沿x-x方向的分力总是互相抵消，而沿Y-Y方向的分力总是相互叠加，这就形成了单一的该方向的简谐力。该力作用在筛箱上，驱动筛箱作轨迹为直线的往复振动。

During oil production, pumping rod is eccentric in the long oil tube, in which flow of the swabbed fluid can be regarded as an unsteady flow of second-order fl.

在采油过程中，由于油井较深的缘故，抽油杆在油管中是处于偏心位置的，可以把聚驱井抽汲液在井筒中的流动视为二阶流体在内管做轴向往复运动的偏心环空中的非定常流动。

A proven technology that weens us off fossil fuels and in some ways performs better than over complex reciprocating petroleum engines and transmissions.

行之有效的技术， weens我们小康矿物燃料和在某些方面的表现优于复杂往复石油引擎和传输。

The liquid level can be measured. Said upper- and lower-limitation alarm is sound-light alarm. The valve can be controlled. The impurities in valve can be automatically removed by the reciprocating movement of valve, resulting in more convenient and more safe liquid level control.

本发明可对液位进行测量，具有上、下限报警功能，同时可以控制阀门开／关，并可通过阀门的往复运动自动清除阀内杂质、使液位控制更简便、更安全。

The company mainly produces chemical process pumps, high pressure reciprocating pump, piston metering pumps, hydraulic diaphragm metering pumps, mechanical diaphragm metering pumps, gear pumps, meshing, the meshing gear pumps, small flow pump, single screw pump, double-headed Screw pump, three screw pump, shielding pump, magnetic pumps, liquid pumps, boiler feed water pump, steam reciprocating pump, fluorine plastic pump, slurry pumps, water treatment and medicine, environmental protection equipment, industrial pumps accessories, annex Buffer, back-pressure valve, filter, check valves, safety valves, instrumentation, and other on-line

公司主要生产化工流程泵、往复式高压泵、柱塞计量泵、液压隔膜计量泵、机械隔膜计量泵、内啮合齿轮泵、外啮合齿轮泵、小流量离心泵、单螺杆泵、双头螺杆泵、三头螺杆泵、屏蔽泵、磁力泵、液下泵、锅炉给水泵、蒸汽往复泵、氟塑料泵、渣浆泵、水处理加药系统、环保设备、工业泵配件、附件缓冲器、背压阀、过滤器、止回阀、安全阀、在线检测仪表等

However, it is possible to eliminate this backlash in ball screw systems, making possible to ensure accurate positioning in reversing applications.

然而，在滚珠丝杠的传动系统中，消除回程间隙成为了可能。这样可以保证了往复定位的精度。

The design work involves: overall design of milling machine, draw out of drive project, design of lathe bed, theory design and calculate of feed part, and the design of to-and-fro guide screw leading screw for profile modeling machining.

专用铣床的设计包括：铣床的总体设计，传动方案的拟订，床身的设计，进给部分的理论设计和计算，以及用来仿行加工的往复丝杠的设计。

The control of an electromagnetic valve in the ABN brake chamber forces the spring to vibrate at a frequency of 18 times per second while braking, and also with certain natural frequency reciprocating motion.

利用停易ABN制动气室弹簧的振动及电控装置控制电磁阀激振，迫使气室弹簧在整个制动过程中不但以每秒18次的自振频率振动，同时又以一定的固有频率往复运动，利用弹簧的储能作用，将刹车时产生的声能和热能用弹簧的势能和动能来置换，从而达到降低制动噪声、温度和磨损的目的。

An industrial sewing machine for the completion of a button hole comprises a needle holder that is connected via an arm to means which ensure a forward and backward motion perpendicular to the direction of the needle.

一种用于缝制钮扣眼（1）的工业缝纫机包括一个通过一臂（21）与一装置相连接的缝纫针夹持器（20），该装置确保缝纫针夹持器沿着垂直于缝纫针运动方向的方向往复运动。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。