往复

When the hand wheel rotation, driving the plunger in the hole through the stem up and down reciprocating motion of the middle frame to complete the valve opening and Two Piece Trunnion Ball Valve closing function.

当手轮旋转，通过阀杆带动柱塞在孔架中间上下往复运动来完成阀门的开启与关闭功能。

The sound of double crutches beating the ground echoed across the classroom building, forming a peculiar tutti.

双拐击地的声音在教室大楼中往复回荡，形成了独特的合奏。

It is like a huge two-stroke engine, with a capacity of 45 million litres, a stroke of 3 kilometres, and a frequency of one revolution per hour, says Edmonds.

"就像一个巨大的，4500万公升的二行程引擎，一个行程3公里，一个小时一往复。"埃德蒙说。

It is applied to sorts of locomotive engine , In course of revolving of Crank and Connecting Rod Mechanism, there are revolving of the crankshaft , swinging of the connecting rod and reciprocating motion, so its motion state is complex, and periodic unbalanced force, by a few components, is great.

曲柄连杆机构在高速运转过程中，有曲轴的转动、连杆的摆动及活塞的往复运动，其运动状态复杂，各个部件所产生的周期性不平衡惯性力大，是引起发动机振动的主要原因。

A method to develop a reciprocating translation with uniform moving velocity was provided.

在某些机床中，往复运动基本上是用曲柄摇杆机构或曲柄导杆来实现的。

LTHJ-SUPER-A2 welding manipulator automatic recovery machine(Condensed air is needed0.4-0.8Mpa) This system is set for welding manipulator,special cylindrical welding tools or difficult welding .It adds super negative pressure wind pump on inner side offlux cylinder,so that in the welding process it can absorb unmelted flux directly into cylinder and place into a small hopper.Open the valve of small hopper and put flux onto work piece,then you can put it into reprated usage.

LTHJ-SUPER-A2型操作机正压自动回收机（需压缩空气0.4-0.8Mpa）本系统是为一体超强新型的操作机或外圆焊接特制工具、高难度的焊接而设置的，它利用压缩空气，将在焊接过程中尚未溶化的焊剂直接吸收到桶内，放置到小料斗中，打开小料斗阀门把焊剂放到工件上，进行往复使用。

This seems very unpromising to me, with all those heavy doors banging in and out; it's not exactly free of reciprocating parts, as noted at the time.

这似乎是很没出息，我与所有那些沉重的门，撞及在列；它的不完全免费的往复部分指出的那样，在时间。

Methods A total of 23 patients were operated under general anesthesia. Laparoscope was used with left and right sports to dilate the retroperitoneal cavity. The renal cyst was exposed and all the cyst walls were unroofed 3~5 mm from the edge of renal parenchyma.

23例采用全身麻醉、腹腔镜体左右往复运动扩张后腹腔，显露肾囊肿，距肾实质3~5mm将囊壁切除去顶。

In truth, most students vacillate back and forth, ending up somewhere in middle.

而实际上，大部分学员在这两方面来回往复后，最终都选择了一条中庸之道。

Shaft, used to produce variable or reciprocating motion in another engaged or contacted part.

偏心'。''轮或复合曲线轮，用以使相连的或相接触的其它部件产生多变的或往复的运动

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。