Bolt was in relaxed mood before the race, showing off to the cameras and wearing a t-shirt bearing the phrase "Ich Bin Ein Berlino", in reference to Berlino the bear, the event's mascot.
Through-holes in the bearing rings make it possible to bolt the bearings to the lower and upper structure.
轴承圈通孔使轴承特殊的设计可能使传动装置来驱动有轴承支持的结构。
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The key position bolt of the engine include connecting rod, crankshaft, main bearing, cylinder head, flywheel and shock absorber bolt, all of which belong to bolt fastening.