轴线，可让物体围绕着作旋转运动的一个想像的直线或实际存在的部件(如轴)。
AXIS, an imaginary straight line or an actual physical component (such as an axle) around which a body can rotate.
为了避免出现运动部件的过早磨损、噪音或振动运行，就要根据流体状态选择止回阀的通径。
Premature wear and noisy operation or vibration of the moving parts can be avoided by selecting the size of check valve on the basis of flow conditions.
必须根据风险类型选择用于防护由运动部件引起的风险的防护装置罩或保护装置。
Guards sor protective devices designed to protect against risks arising from moving parts must be selected on the basis of the type of risk.
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