图中左边的样本，曾经被认为是一种具有硬壳的埃迪·卡拉藻类，其实际直径小于一毫米。
The object on the left, less than a millimetre across in reality, is an example of what were once thought to be the encysted forms of Ediacaran algae.
它的直径实际上是 2.5 厘米。
实际切圆直径是锅炉稳定安全运行的一个重要参数，炉膛出口残余旋转是造成烟温偏差的主要原因。
The diameter of actual tangent circle is an important parameter for safety of boiler, the residual rotation is the key factor of flue gas temperature deviation at furnace exit.
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