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reverse turn 【航空】(方向的)急轉。

reversibility

Push the button when the door is descending , the door can descend merely by gravity without the motor driving there of , which can keep the door from reverse - wrap and reverse turning to damage door 下降時按下開關,可不用驅動馬違而以自動下降,遇障礙物時、不致產生逆摺、逆轉而損壞?門。