Feedback loop — a closed path that connects an action to effect on the surrounding conditions which, in turn, can influence further action.
反馈循环——在一个循环条件下连接行为和结果的封闭回路，依次的，能影响更多行为。
Double loop high speed vacuum suction system, spread to the surrounding air by the central.
双回路高速真空吸气系统，由中央向四周扩散吸气。
Double loop high speed vacuum suction system, spread to the surrounding air by the central.
双回路高速真空吸气系统，由中央向四周扩散吸气。
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