So, you can get the mass of a flat object with density.
因此，可以通过密度求一个平面物体的质量。
The density for a flat object would be the mass per unit area.
一个平面物体的密度是每单位面积元的质量。
The other way to think about it, if I had a flat object then the center of mass would basically be the point where I would need to hold it so it is perfectly balanced.
从另一个角度看，一个平面物体的重心就是,如果在重心处拿起物体，它就能完全地保持平衡。
On our spherical Earth, gravity pulls "down" us toward the planet's center of mass. So on a flat surface, we naturally stand up straight.
在我们地球上，重力会把我们拉向星球的质量中心，因此在平坦的地表，我们自然站得很直。
The auditing log is specified as a flat file called audit.log in which every line is a comma-separated string of the format timestamp,jar id,sweet type code, jar size code,mass of jar.
审计日志被指定为一个名为 audit.log 的平面文件，其中的每一行都是一个以逗号分隔的字符串，格式为 timestamp,jarid,sweettypecode, jarsize code,mass of jar。
By analyzing the ultrafiltration process of flat membrane, differential equations of momentum transfer and mass transfer describing the process are established.
通过分析平板膜超滤分离过程，描述了超滤过程动量传递和质量传递的微分方程，求解方程得到速度分布和浓度分布曲线。
The results show that the mass loss rate increases with increasing the vacuum thermal cycles, and becomes flat after 48 cycles;
试验结果表明，随真空热循环次数的增加，质损率增大，并经约48次真空热循环后趋于平缓；
A flat, broad irregular, solid mass echoic pattern.
扁平、宽基底、表面不规则的实性回声型。
Taiwan's AU Optronics and Chi Mei Optoelectronics, the world's third - and fourth-biggest flat-panel makers respectively, are both already mass-producing e-paper displays.
台湾友达光电(AUOptronics)和奇美电子(Chi MeiOptoelectronics)均已在量产电子纸显示器，它们分别是全球第三大和第四大平板生产商。
Taiwan's AU Optronics and Chi Mei Optoelectronics, the world's third - and fourth-biggest flat-panel makers respectively, are both already mass-producing e-paper displays.
台湾友达光电(AUOptronics)和奇美电子(Chi MeiOptoelectronics)均已在量产电子纸显示器，它们分别是全球第三大和第四大平板生产商。
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