单词	roll bar
释义	roll bar noun A metal bar running up the sides and across the top of a vehicle, especially one used in motor sport, strengthening its frame and protecting the occupants if the vehicle overturns.Copvertibles are more prone to flexing than are hardtops, so they will benefit the most from a well-built roll bar or cage.... There's a roll bar to offer some protection to the top of the cylinder head and a hefty foam bumper at the front of the car. Start by contacting the manufacturer to find an authorized dealer in your area who can equip your tractor with a roll bar and a seat belt.
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