An analysis of a type of angular contact ball bearing under given input power spectrum density is performed. The result demonstrate that the bearing is safe in any load direction.
以某种角接触球轴承为例，验证了其在给定输入功率谱密度下任意方向加载都安全。
The main reason of the origin of the T-ball is training children, and it became a new favorite sports items soon for its entertainment, competition and safe.
为了培养少年儿童对棒球和垒球的热爱而研发的T球运动，因其集娱乐性、竞技性、安全性于一体，成为了一项男女老幼皆宜的新兴体育 运动项目。
The main reason of the origin of the T-ball is training children, and it became a new favorite sports items soon for its entertainment, competition and safe.
为了培养少年儿童对棒球和垒球的热爱而研发的T球运动，因其集娱乐性、竞技性、安全性于一体，成为了一项男女老幼皆宜的新兴体育 运动项目。
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