30年前，当五个在洛杉矶的年轻男同性恋者被一种疾病击垮时，一场逼近的世界性灾难渐露迹象，而这种疾病正是闻名的艾滋病（获得性免疫缺陷综合征）。

Thirty years ago, the world got its first inkling of impending catastrophe when five young gay men in Los Angeles were struck down by the illness that became known as HIV/AIDS.

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事实上，在研究人员观察的16种免疫缺陷病毒中，除五种以外，其他十一种都具有各自的nef基因以去除细胞表面的TCR-CD3蛋白。

Indeed, of the 16 immunodeficiency viruses the researchers looked at, all but five had nef genes that removed TCR-CD3 from the cell surface.

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本文根据传统的直角坐标数控雕刻机的缺陷，结合工业机器人的运动学特性，研制了一种五自由度关节式雕刻机器人。

By analyzing the disadvantage of the traditional NC engraving machine based on orthogonal coordinates and the kinematics characteristic of industry robot, a robot with five knuckle arms is designed.

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