A device for protection from the weather consisting of a collapsible, usually circular canopy mounted on a central rod.
雨伞用来防风雨装置，由某在一根中心柱上的可折收的，经常是圆形的罩蓬构成。
A ceramic rod with favorable heat conductivity is arranged on the bottom of a crucible to be used as a support seat to enhance the heat dissipation of the central position of crystal.
坩锅底部采用了导热性良好的陶瓷棒作支座，以增强晶体中心部位的散热。
The principle and method for quarto-rod can be analyzed as a device simply through rotation of the half Angle so as to find the central and circular points.
分析了采用半角转动法求中心点和圆周点以进行四杆机构综合的原理和方法。
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