Taking Shanghai Middle Ring Road project as example, the principle and effect of D-125 as a waterproof agent are described.

并以上海中环线工程为例，介绍了D-125有机硅浸渍防水剂的防水原理和防水效果。

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The axial fixed position preload is applied to middle ring of the shaft, the axial rigidity of the angular contact ball bearing is obtained by the impulse excitation tests.

对转台中环主轴施加轴向定位预紧力，通过脉冲激励法试验得到角接触球轴承的轴向刚度，试验结果与理论结果吻合较好，为转台研制中各轴系预紧量的控制提供了理论和实验依据。

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Two-way pressure has mounted on ball bearings between the shaft and two outer rings, in the middle ring and outer ring were added between the steel ball, able to withstand the two-way axial load.

双向压力球轴承有安装于轴上的中间圈和两个外圈，在中间圈与外圈之间分别加有钢球，能够承受双向轴向负荷。

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It is narrow in the middle. On top is a large ring-like structure.

VOA: special.2009.03.04

In addition, a new portion of the Middle Ring Road was constructed, reducing travel time to the Pudong Airport by 20 minutes.

BBC: Shanghai after the World Expo

Under the same hand's middle and ring fingers sit two buttons in charge of chucking in-game grenades.

ENGADGET: blogger-avatar

On the blaster's grip are the A and B Button equivalents, which are positioned to fall under a user's middle and ring fingers.

ENGADGET: blogger-avatar