1、
Hocks short, parallel and when viewed from the side are perpendicular to the ground.
飞节短, 彼此平行,从后面侧面观察,垂直于地面.
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2、
3、
刚体的转动-转动惯量 - 平行转轴定理和垂直转轴定理 - 转动动能 - 飞轮 - 中子星-脉冲星.
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4、
5、
When a surface is perpendicular to the rays, their intensity is at its maximum.
当表面与射线垂直时，射线的强度最大。
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6、
7、
When a surface is perpendicular to the rays , their intensity is at their maximum.
当表面与射线垂直时, 射线的强度最大.
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8、
A corner cube consists of three mutually perpendicular reflecting planes.
角棱镜是由3个互相垂直的反射平面组成.
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9、
