补充词语。
平安____事 ____如其来 ____肉同____
如图,一只钢球从圆槽的顶端滑下,若滑到最低点(O点)时,钢球受到的一切外力同时消失,则钢球的运动路线是( )
—Pardon? It's difficult to hear your _______ because the _______ of traffic is too loud.