您要查找的是不是：
- A planar region bounded by a circle. 圆形区，圆形空间被圆所包围的一个平面区域
- planar density 面密度
- The density of population in this city is very high. 这个城市的人口密度非常高。
- The area had a population density of five people per square mile. 该地区人口密度为每平方英里五人。
- A planar surface of a geometric solid. 表面几何图形的多面体的表面
- The density goes down exponentially with height. 分子密度随着高度的上升而指数衰减。
- Trapezoidal no volume! It is a planar graph! ! ! 梯形没有体积！它是一个平面图形！！！
- The population density is evened out. 种群密度亦趋于均匀化。
- Density exceeded 100 nests per mile. 丝巢密度超过每英里100巢。
- Do you know the density of population in this area? 你知道这个地区的人口密度吗?
- This wave of excess density is sound. 这种过剩密度的波就是声波。
- The density logger consists of a radiation source. 密度测井仪包括辐射源。
- Methods Investigating the rodent density by ELTON. 方法用ELTON夹夜法对鼠密度进行调查。
- By the charge density we mean the per unit volume. 所谓的电荷密度是指单位体积的电荷。
- The entropy density is constant ahead of the shock. 冲击波前方的熵密度是恒定的。
- The driver had to stop because the density of the fog made it difficult to see. 由於浓雾使道路很难看清,司机不得不停车。
- Mercury has a much greater density than water. 水银的密度比水大得多。
- The planar five-bar robot is a typical parallel robot with two-DOF. 平面五杆机器人是典型的两自由度平面并联机构。
- Planar antenna has small size, light weight and low profile. 尤其平面天线以其体积小、量轻、剖面，能与载体共形、集成、于匹配等优点获得了更多青睐。
- Yarn number is a measure of linear density. 纱线细度是纱线线密度的一种度量方法。
