Flap barrier gate, tseem hu ua tis rooj vag, yog ib hom kev nkag mus tswj qhov system uas siv los tswj cov neeg khiav dej num hauv thiab tawm ntawm lub tsev lossis thaj chaw.Nws feem ntau yog siv rau hauv qhov chaw xws li tshav dav hlau, chaw nres tsheb ciav hlau, thiab lwm qhov chaw pej xeem uas xav tau c ...
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