四元生命管理系统，简称四元系统，首台仪器由世界自然医学研究院于2010年开发成功。
语言说明符总的说来并不是该语句的特性（这就是为什么国际化没有将 RDF 转换成四元组而是三元组系统的原因）。
The language specifier is not a property of the statement as a whole (which is why internationalization does not turn RDF into a system of quads rather than triples).
对高精度导航系统和大机动场景来说，对偶四元数算法是一个更好的选择。
The new algorithm turns out to be a better choice than the conventional algorithm for high-precision navigation systems and high-maneuver applications.
本文以姿态误差四元数与陀螺漂移误差之间的关系为基础，构建了系统状态方程；
The state equations of the system are established on the basis of the relation between attitude error quaternion and the gyro drift.
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