roll-bar

n bar used to strengthen the roof of a car and protect the occupants if the car rolls over 翻车保护杠（汽车顶部的加固杠, 翻车时可保护乘车人）.

roguery, rogues' gallery, roguish, roguishly, roguishness, roil, roister, roisterer, roistering, role, role (also role), role-play, roll, roll around, roll back, roll in, roll into, roll of honour, roll out, roll up, roll-call, roll-on, roll-on roll-off, roll-top desk, roll-up, rolled gold, rolled oats, roller, roller bandage, roller towel, roller-blade, roller-coaster (Brit also switchback), roller-skate (also skate), roller-skating, rollicking, rolling stone, rolling-mill, rolling-pin, rolling-stock, rollmop,