在上次冰河时代，白令海峡这种周期性的开闭，影响了洋流，进而影响冰盖融化的速度。
The strait’s status in turn affected ocean currents, which affected the rate of ice sheet melting during the last glacial period.
针对扫描镜精密伺服系统，本文采用按照电流环、速度环和位置环等三个回路进行控制系统设计的开闭环复合控制方案。
The scanning mirror precise servo system is designed by the scheme of compound control of open and closed loops with current, velocity and position loops in this paper.
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