顶圆是龙眼一个品种名称，广东中部丘附地区惠阳、博罗、紫金的主栽品种。树势旺盛，叶绿色，长椭圆形或阔披针形，先端钝尖。
齿顶圆 [机] addendum circle ; tip circle ; External circle ; Outside circle
齿顶圆直径 tip diameter ; outside diameter ; Addendum circle diameter ; da
齿顶圆半径 Outside radius ; tip radius ; radius of addendum
齿顶圆角半径 Tip radius ; [机] radius at tooth tip
齿顶圆柱面 [机] tip cylinder
齿顶圆锥母线 Face cone element
外端齿顶圆 crown circle
顶圆锥角 tip angle
顶圆直径 Tip diameter ; outside diameter circle
这种测量工具用以测量奇数齿齿轮的齿顶圆和齿根圆直径。
The measuring instrument can measure addendum circle and dedendum circle diameter of odd-tooth gears.
我想买一顶圆礼帽。
它是外花键的齿根圆，和内花键的内圆(齿顶圆)。
It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.
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