Kev ua haujlwm ntawm bumper qhov chaw ntawm blister tshuab khoom

Tsheb bumpers (kev sib tsoo kab teeb), nyob rau hauv ntau qhov chaw ntawm lub hauv ntej thiab nram qab lub tsheb, yog ostensibly tsim kom tsis txhob muaj kev cuam tshuam ntawm sab nraud kev puas tsuaj rau lub tsheb kev nyab xeeb system, lawv muaj peev xwm txo tau tus neeg mob raug mob nyob rau hauv high-ceev cuam tshuam, Ntau thiab ntau dua tam sim no tau tsim los tiv thaiv cov neeg taug kev.