The moon's mean diameter is generally calculated to be 2, 159 miles.
月球的平均直径大约为2,159英里。
The size distribution and mean diameter were measured by laser light scattering technique.
动态激光粒度分析仪测定其平均粒径大小和分布；
Moreover, the results of laser Raman resonant measurements indicated a larger mean diameter of our SWNTs.
激光拉曼分析结果表明制得的单壁纳米碳管直径较大。
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