The solar tracker has two working modes, open loop mode and closed loop one, and it consists of an imaging unit, a turntable, steppers, the subsystem of micro control unit, a computer and so on.

提出的太阳跟踪器具有开环和闭环两种工作模式，由成像单元、转台、步进电机、单片机、上位机等模块构成；

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More money has been raised by so-called private investments in public entities (or PIPEs) so far this year than anytime since their 2000 peak, according to Placement Tracker, a unit of Sagient Research Systems.

FORBES: Piped Aboard