Statecorrection systems have exploded in recent decades.
各州教改体制在最近的几十年急剧膨胀。
2
Correction: in the original version of this article, we said the Bald Hills project was located in the state of Queensland.
更正：原文中，贝恩山项目被指为在昆士兰州。
3
Combined with the system state equation and the measurement equation, a new method of the cascade Kalman filter is proposed and applied to the correction of gravity anomaly distortion.