The disc and associated moving parts may be in a constant state of movement if the velocity pressure is not sufficient to hold the valve in a wide open and stable position.
如果流体流速压力无法将阀门支撑在一个较大的开启度并保持在稳定的开启位置，则阀瓣和相关的运动部件可能会处于一种持续振动的状态。
If you have an assistant, holding the camera is fine but be sure you are seated in a stable position.
如果你有助手，你手持相机也OK，但是你一定要坐好了不动。
You should feel a little more stable about your position; however, don't be surprised if a job offer comes your way.
巨蟹座： 对自己的职位会感到些许稳定，但是如果有新的机会也不要置之不理。
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