互相垂直的线构成的90度直角往往能创造视觉刚性，进而联想到永久与可靠。
The 90-degree angles formed by perpendicular lines have a tendency to create visual rigidity, which in turn suggests permanence and reliability.
成核剂是聚烯烃的功能型助剂，它可提高聚烯烃产品的刚性、透明性以及表面光泽度。
Nucleating agent is a functional accessory ingredient of polyolefin that can improve the rigidity, transparency and surface gloss of polyolefin products.
建立了冗余度机械臂协调操作的数学模型，利用该模型对两机器人抓持同一刚性物体进行了仿真研究。
The kinematical model for coordinating manipulators is constructed and research is done through simulation examples for two coordinating manipulators holding one object.
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